Its Spring !!

Year after year, yellow-billed kites arrive in the kzn region during the first week of August.  This year proved that rule yet again.  Although I heard of first-sighting from several friends for three days prior to mine on the 9th of August.  And then during the week of 12-17 August, spent surveying the Durban reserves and their eagle nests, the influx of yellow-billed kites has been notably frustrating.  With so many raptors in the sky I have glanced at each on incase of crowned eagles - this has been a bit of a traffic hazard perhaps!  As well as the abundant kites, this week has also been the first sightings for wahlbergs eagles and steppe buzzards.

The migrants have started to arrive, and the crowned eagles are already well underway with this years breeding attempts. 

even the best vantage points for most nests leave much of the detail obscured 

this enormous nest has been built onto for over a month, now lined with many leafy sprigs

the pair at the Kranzkloof gorge are also doing well with their construction. And last years juvenile is not far from home

this nest failed around hatching time last year, and now has been occupied by egyptian geese

thats what we like to see !

and another happily incubating her clutch

Spring comes early for crowned eagles.  In the southern limits of their range, this population may be taking seasonal cues such as the lengthening days to establish a breeding season.  Perhaps over the years they have also synchronized a breeding season to make use of hadeda nestlings and young dassies come November, when the chicks are most demanding for food.  In any case many nests are well prepared, built up large and lined with soft leafy sprigs, while others are already incubating.  As yet it seems none have hatched. 

Whilst surveying, I had a chance to test my camera’s abilities – and it have proven that my binoculars are pretty much obsolete.  In December last year the lastest Canon PowerShot hit the stores.  The SX50HS.  50x optical zoom and then 4x digital multipliers pulls distance objects in to 200x zoom… my 10x42 Shirstone binoculars pale in comparison.  Indeed on two occasions (photos below), I glassed the nests and didn’t see anything obvious there - only to take a photo and confirm the eagles head glancing over the lip of the nest!!!

no better way to get an accurate laying date than visiting the nest between 1st and 2nd egg laying !

Victoria Country Club Photo Diary

Burkhard Schlosser has been at the Victoria Country Club Estate on almost a daily basis for the last few months.  He has had his camera trained in one particular direction from one particular spot at the Estate.  Trained towards the Crowned Eagle nest that has become somewhat famous in the area.

This nest is quite a special one for me.  It is the first eagle pair to nest on an artificial platform that I built for a raptor. I put this up for them after they failed to build their own nest earlier last year.  Once the little eaglet reached 15 days of age I was able to put up a nest camera to record all the behavior and especially, the food, of this nest since.  Having being called Donna for months, a blood test during the ringing process confirmed this eaglet was indeed a Don.  The mum is named, appropriately, Victoria, a regal and hard willed girl, and by default dad is Albert.

It has been very nerve racking to work with this particular nest because, despite the carefully planned ethical considerations and cautions for the study methods employed in my own research. There is great deal of passion, enthusiasm, caution and personal connection to these birds felt and expressed by the local residents and public around the VCCE.  So while being so concerned with the welfare of the bird from my own perspective, I would also feel that much worse by empathizing with the public followers of these birds should anything happen to them. The stability and durability of the built nest site, the disturbance from monthly climbing to the nest to service the cameras, and the delicate operation of briefly removing Don from the nest to ring and record a bunch of morphometric data.  A bunch of nests did fail this year, mostly seem due to bad weather during the hatching and newly hatched stage, but I am glad to say all of the five nests that I studied with cameras have successfully fledged.

Thankfully we have has a very good run with this pair and that we have collected a remarkable set of prey data from the camera.  67,000 photos.  This is mostly thanks to Ron Perks who was the driving force behind securing the donations required to purchase the equipment used for the study, with acknowledgements to all of the various supporters for the Victoria Country Club Estate surveys.  I have recently done the prey analysis for the first four months of operation to date.  I am quietly holding onto that data for now, so that there will be great revealing of the new data on the night that I make a presentation to be held at the Victoria Country Club on the 9^th of April.

So while there are quite a few example photos from the camera to be seen on previously published blogs.  The photos leading to fledgling won’t be posted here yet.  Maybe later in April?  So for now though, I am happy to reproduce here a bunch of Burkhard’s photos, with his permission of course.  Burkhard has been getting his photos spread far and wide, and some of these are on Africa Geographic, a stunning photo of a Malachite Sunbird was on the cover of Wild Bird Trust website, and there are plenty of followers to frequent updates on facebook.

All rights to these photos are copyright to Burkhard Schlosser.

Victoria feeding little Don on the 28th of October.  The camera (black bok to far left) has been in place since 21 October

After the meal Victoria likes to bring fresh gum sprigs to cover the remains of the food

Don at 47 days old.  23 November 2012

With still very undeveloped flight feather, Don exercises and develops muscles. 72 days old on 18 December 2012

Despite the look, Victoria is grateful for the food given by Albert. 22 Dec 2012.  Don was ringed at 80 days old on 26 December 2012.

Lunch delivery 12 Jan 2013

Gentle motherly tenderness at feeding time. 12 Jan 2013

At 97 days old, Don's flight and tail feathers are still growing. 12 Jan 2013

At 99 days old the wings have an impressive spread and catch a lot of air. 14 Jan 2013

Branching', walking out and jumping back to the nest, three days before first free-flight.  17 Jan 2013

Freedom of flight. 21 January 2013

Out on a limb. 21 January 2013

Don has an urge to return to the nest regularly.  He continues to be fed on the nest. 21 January 2013

Albert bringing in another morsel. 27 January 2013

Relaxed and windswept, at just under four month old, Don is a beautiful eagle. 2 February 2013.

Obituary Number One

On the 12th of December I answered a phone call from the SPCA in Pietermaritzburg.  They had just received the still-warm body of a Crowned Eagle from a distraught local.  I arrived at the SPCA soon after to collect the remains, my heart sank.  The bird seemed in fine condition, mottley with new feathers molting through, powerful and clean talons, and plenty of muscle on its breast.  A little blood oozed from a tiny hole near the lower jaw.  We surmised it was shot and immediately sought to open an investigation with the police.

This bird was ringed.  I identified it as a juvenile that I caught near its Clarendon nest site on the 25th of July 2012.  That day, we waited until the kids in the park left the area, then set a trap and quickly had her. I restrained the eagle while Minke ringed it, and we had assistance from the Clarendon Veterinary Clinic staff.  This was the second only to be ringed for the entire study, we were full of nerves and excitement and looking forward to following this character on a long life laid out ahead of her.  I released the bird once we'd ringed and measured, and the photos were featuring on the UKZN homepage for a while.

in July 2012, at nine months of age, a beautiful juvenile eagle

in her urban home she became accustomed to the presence of people - these lightys respected that

A camera trap deployed whilst trapping this eagle

It is the first ring recovery from my study.  And casts a dark shadow over the impression that these eagles are thriving in the city.

Shot in the head with a air rifle.

During the winter of 2011, the resident adult pair repaired their nest and laid their egg.  The residents around the Clarendon nest site watched with anticipation. Hatched in October 2011, the chick flourished on prey the adults brought to the nest, mainly hyrax and Hadeda Ibis.  It became extremely well known and popular among the residents and visiting photographers. Nearly four months later, on the 12th of December, the youngster made its first flight.  It then stayed in the immediate area for another seven months, as these large eagles take a very long time to learn the techniques to hunt for themselves.  Its insistent calling for food from the untiring parents made it a conspicuous and much-admired bird.

This eagle was one of the first to come to my attention, two months after arriving in South Africa to start the research.  After ringing it in July,  I kept my ear to the ground, phoning to receive the latest sightings and reports on the birds behaviour   It started to wander, apparently hunting successfully for periods before returning to the nest area occasionally to try its luck begging for more food.

Eventually, on the 14th September 2012, this young eagle was heard calling from its usual spots for the last time.  It was time to move out to a life of independence, to fend for itself and ultimately establish its own territory. This is the most dangerous time in a Crowned Eagle’s life, finding a place of its own, with enough prey to master the skills of hunting to avoid starvation.  Indeed, as we now know, the young eagle succeeded in overcoming this obstacle to its survival - it had a full crop, probably a hadeda, and a long bone extending from its crop that it was apparently still in the process of swallowing.

John Carlyon, Clarendon Vet Clinic, extracting the pellet

lead shows in an xray as a bright white blotch, the bone in the throat also shows on the xray

The autopsy was performed recently, in the presence of South African Police, photographers, and an honorary officer of the Ezemvelo Wildlife Crime Investigations Unit.  The ballsitic extraction revealed a .177 airgun pellet,  a shamefully tiny projectile, lodged right below the first cervical vertebra.  This was a well placed shot, a consolation that the bird did not suffer a painful and slow death, as many do when they have pellets festering in non-lethal parts of the body and limbs.

She travelled just seven kilometres from her place of birth, and survived just 15 months of what could have been a full 40 years of life.  Wantonly destroyed in an act of criminal stupidity.  Parents who provide children with dangerous weapons such as pellet guns should be made accountable for their actions. It is essential that these actions are met with the full force of the law.

Co-authored by John Carlyon and Shane McPherson

Human-Wildlife Conflict

The research is towards an MSc, and is an urban ecology project of which Crowned Eagles are used as a model species. One of the dominant topics regarding predators (carnivora and accipitriformes) in areas of high human density is the Human-Wildlife conflicts.  Sources of negative perceptions and conflicts towards wildlife exists in many forms including:

• biodiversity threats: semi-feral cats and monkeys can become superabundant with the help of supplementary food and absence of natural predators. Their impact on birds and nesting success may be high.
• nuisance animals: racoons spread garbage while it waits for collection on the kerb
• disease risks: stray dogs and urban foxes are a potential source and vector of rabies
• health and safety: coyotes and eagles can threaten the safety of household pets - cats and small dogs that their owners have a emotional attachment to.

This last point is the topic of the day.  Below is some information regarding a particular eagle that I have been following.  It was infact the very first eagle captured and ringed for this project.   The community is becoming polarized, some wanting to give the eagle full protection and let it live and disperse naturally, others (most of those impacted by attacks on pets) want it gone immediately. 

Footnote:  since sending this response I have had three different responses that the juvenile eagle was indeed offered food (viennas even- full of nitrates and additives).  Those particular tenants have since moved on - and in their wake have left a legacy of a 'problem eagle'.

DO NOT FEED WILD ANIMALS

Raptors and People

You may find this particular blog delving into grandiose explorations of they way in which I perceive the world; about the global impact of people, the way in which our ecosystems are being shaped, and the perceptions of and impact upon wildlife – so sorry about that.  But more importantly it should help explain why I lead myself into this particular research project – over and above my fascination and reverence of the Crowned Eagle in particular.

Anthropogenic environments:  Ecosystems which are created or modified to various extent by human modifications.  In the broadest view, it seems the entire biosphere as increasingly anthropogenic.  The changing atmosphere is the case in point.  While the change in atmospheric composition is still modest, rising carbon concentrations are already having a measurable influence, one which will continue to accelerate.  If runaway climate change forces humanity to implement one or several geo-engineering concepts it will be a stunning demonstration of the both the immense influence, and utter lack of control we have.

Anthropogenic modification is varied in scale and intensity of alteration.  Take for instance here a GoogleEarth view of Denmark, a landscape which is almost entirely composed of three basic categories: agricultural, silvicultural, or human domiciles. The urbanization of Copenhagen is seen stretching out from the eastern coastal margin.  All of the wildlife diversity that lives here does so because it is able to exist or exploit some part of this anthropocentric landscape.  There is a respectable diversity of birdlife, but Denmark is one of a handful of countries to have no nationally endemic bird species.

The island of Sealland of Denmark.

A particularly fortunate example of a species’ exploitation of a changed landscape is the response of New Zealand falcon to a particular timber plantation in the central North Island.  I assisted Dr. Richard Seaton during his PhD research on this falcon population.  A research project which discovered that in this ecosystem dominated by a monoculture of an exotic timber tree, here lives the highest density of NZ falcon known in the country.   Why should they thrive here when they are far rarer in native forests in the mountain ranges up and down the country?

Kaingaroa Forest is extensive – approximately 140,000Ha, and is sustainably harvested because it is divided into small compartments of uniform aged stands.  Because of this mosaic effect (despite the monospecies canopy) there is good structural variation, with plenty of edges between various age stands.  These edges allow understory plants to establish rapidly in growing stands.  They allow birds which require mature pine stands for shelter and nesting to be nearby clearfell areas with booming populations of detritivorous insects.  The birdlife is surprisingly rich, including an abundance of some NZ endemics struggling in native forests; whitehead, tomtit, and their parasites; long-tailed koel and shining cuckoo are particularly thriving.  Clearcuts attract loads of insects and grasses seed in these first years, which inturn supports the most abundant birds in the forest, introduced finches like chaffinch, greenfinch and redpoll abound.  And because of this abundance of birdlife, falcons can thrive, preferring to nest on the ground in clearcut areas.  But why does it seem that populations of rodents and their mammal predators have a greater impact in native forests than they do here?

Kaingaroa Timberlands from microlite. Copyright Richard Seaton.

The NZ falcon in particular has the potential to be very adaptable to various anthropogenic habitats.  But despite all the prey available in the agricultural and urbanized areas, why have they so far been unsuccessful urban colonizers?  The Falcon for Grapes project in the Marlborough wine region provided some explanations.  Despite promising signs that falcons have a significant impact of reducing grape damage by frugivorous birds, of over 21 falcons to have died during the course of the release project, less than 5% died of 'natural' causes.  Most troubling is that 47% of the birds (and 80% of females) were electrocuted, particularly at transformer boxes, feral cats and hedgehogs were responsible for several nest failures, others succumbed to collisions with windows or cars, yet others were shot by dove or chicken keepers, and a few died horrible deaths from various poisoning incidents, from bathing in sheep dip to falling into open diesel barrels. (Fox, N. 2010. in Wingspan Journal Vol 14)

While New Zealanders try to nurture and promote the remarkable and often unique wildlife, arising from a long pre-history of isolation in the absence of mammals, a contradiction that this is also the nation with the highest per capita cat ownership rate presents a jarring realization.   There is a disconnect between the way academics value biodiversity, and the way the majority of the public connects with nature (patting Tibbles on their lap while watching the telly).  If a falcon should turn up at a chicken coop or dove cot, it is all too often shot.  Even a surprising proportion of birders dread the appearance of ‘damn sparrowhawks’ at their garden bird-feeder. 

There are plenty of contradictions to be seen here.  I know of several ecologist in NZ which dedicate their career to conservation projects, and yet they keep cats at home - choosing to overlook the fact that these cats are eating geckos, wetas, and plenty of native birds caught in the garden.

Getting To The Point...

I treasure the ten weeks of fantastic travelling through South Africa last winter, and was overwhelmed by the incredible hospitality of the falconers, conservationists, and wildlife researchers who we spent time with.  The mid-point of the trip was marked by a week-long staying with a Kiwi friend doing a post-doc at the Fitztitute. 

There was a day in Cape Town that I cherish evermore.  We had been invited by Dr. Andrew Jenkins to accompany him for a day around Cape Town for some pre-season monitoring of Peregrine Falcons.  The story of the Cape Peregrines and their expansion into the urban environment is fascinating, particularly as each individual is colour banded and the population dynamics can be traced through the entire urbanizing expansion.  The first urban peregrine pair started breeding on a cooling stack of the refuse station, and after many years of decay this tower was planned for implosion. The city council sponsored installing alternative nest sites for the peregrines and Andrew put up the first boxes on nearby chimney stacks in 2005.  Within an hour of the demolition, with the smell of chordite in the air and dust still settling, the peregrines were copulating on their new nest box. This was the catalyst for urban colonization and boxes were put up at other sites where the peregrines could be better placed.  Another pair attempted to breeding behind an air-conditioning vent of the Rondebosch Childrens Hospital.  With the worry that these chicks would get cooked behind the vent, a nest box was attached to the building also, and these birds have remained here and have been extremely productive ever since.  They have produced four raucous chicks every year for the past seven years, all the while showering the hospital entrance with plucked pigeon feathers and whining and screaming as the juveniles develop. Now the hospital pair has children, and grandchildren, breeding in other areas of the city. 

The tolerance, and even reverence of these tenants by the hospital staff, and the infectious nature of their appreciation to many of the visiting patients and families is an example that ought to be emulated.  It demonstrates that the appreciation of nature is innate, but there are many biases in the way we view wildlife.  Most importantly, those biases can be shaped by a little information, or by the social context in which we share that appreciation of nature with others.

Rondebosch Childrens Hospital. The main entrance, peregrine nest boxes can be seen to left and right of the central brick facade.

A Cape Town urban peregrine, this one photographed at the Centuary City Apartments.

Dr. Jenkins gave me the first whiff of this project.  As we talked about Cape Town peregrines, touched on the success of urban Black Sparrowhawks, and various other urban exploiting raptors.  This was striking a chord with my underlying tendencies for research interests.  Andrew suggested I speak with Dr. Mark Brown at the University of KwaZulu-Natal when we got to Durban.

Having been invited to stay with Bruce Padbury in Hillcrest, we sure had an eventful few days.  Bruce had already organized for a UKZN Masters student to come and capture some Black Sparrowhawk fledglings for her study, which led me into climbing a lofty Blue Gum in at the Pietermaritzburg Police Station to install one of her nest cameras.  I did get to UKZN and bailed Mark up in his office, my eyes lit up when the topic of a study on peri-urban Crowned Eagles came up.  Sure enough, back in Hillcrest the next evening while we were wandering around the back section, a Crowned Eagle turned up, perching atop a nearby tree and, very purposefully looked down her(?) nose upon us.  This was the first wild CE I had seen.  Spectacular!

Hillcrest Crowned Eagle on the Keep

Close up with a great view of those hallux talons!

Some months later and I have developed a research plan, secured enrollment and study visa and today I sit, all packed and waiting to fly out to Pietermaritzburg tomorrow!