A Peregrine Diary
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FAST ATRACKING PEREGRINE DIARY MORE THAN 20 YEARS AGO, CAPE TOWN-BASED ORNITHOLOGIST ANDREW JENKINS BEGAN WATCHING PEREGRINE FALCONS ON THE CAPE PENINSULA. LITTLE DID HE KNOW THEN THAT HE WOULD STILL BE MONITORING THESE BIRDS NEARLY HALF A LIFETIME LATER OR THAT HIS STUDY POPULATION WOULD MORE THAN TRIPLE IN SIZE DURING THAT TIME. TEXT & PHOTOGRAPHS BY ANDREW JENKINS 46 PEREGRINE falcon FEBRUARY/MARCH 2010 PEREGRINE FALCON 47 enkins’s study of this remarkable and spectacular bird is centred on a colour-ringing scheme that allows him to follow the for- tunes of marked individuals from cradle to grave. The aims are Jto identi fy factors that determine the success or failure of these individuals (or their genetic fitness) and to understand the net effect furious of these factors on the status of the population. Direct human support as a result of urbanisation and the incipient effects of climate change have so far been implicated as important drivers of the upward trend in numbers of the Cape’s fastest inhabitant. & Here, in the first of two articles, Jenkins shares his diary tracking the progress of Peregrine Falcons Falco peregrinus during a typical breeding season on the Cape Peninsula. fast As she reaches the light, she simultan- The18 Augustmetal of the tripod slung over eously catches the breeze, and what my shoulder is uncomfortably cold to was a heavy, pulsating shape achieves the touch and my laboured breathing calmer buoyancy, turning in a glide just condenses in slight vapour clouds with below me. Blue-grey, white and black, each step I take up the steep pathway. with a dark, liquid eye ringed in yellow. It’s a chilly morning and I’m walking to She turns again, loses the support of the the tourist look-out area at the southern wind and resumes flapping, all hefty extremity of Cape Point. There’s a hint shoulders and purpose, heading north. of mist over the open Atlantic to the She circles, then approaches the mast west and the rollers are roaring in onto into the breeze, coming in fast and low Diaz Beach far below. The air is fresh, and throwing up suddenly and steeply with a tang of kelp, and as I reach the to drain all power from her flight in old lighthouse at the crest of the hill a a stalled landing. Her claws making a light breeze flurries the anemometer on slightly metallic sound as she grasps the communications mast that stands the steelwork, she settles to look over Previous spread A male Peregrine in just to the north. the bay. defensive mode. Steep, sun-drenched fynbos slopes slip I hurriedly arrange the spotting scope away to my left as I look south-east to - and train it on her, tweaking the focus Above Self-portrait after visiting the wards Cape Hangklip, and shadowy crags into sharpest relief. Since landing, she’s Maitland silo site without adequate on my right drop a startling 200 metres had time to relax slightly, and her plum- protection. Hands-on work at the nest is straight into the sea. There are hundreds age is slackened and ruffled against the a necessary part of this kind of study, but of Cape Cormorants perched on the cold, with one leg retracted into her can be traumatic for both falcons and white-stained sea-cliffs and many are belly feathers and only the scarred toes biologist. wheeling around the rocky tip of the of her gripping foot visible. She shifts point on their way to and from the open her weight and extends her resting Opposite Braveheart. Levels of aggres- ocean. Suddenly, from the shadows leg, then proceeds with a meticulous sion by parent falcons (mainly females) of the tallest rock-face, panicked cor- bout of preening. After several minutes during visits to the nest vary from highly morants start peeling away from the of intensive work, she pauses to look irritated in some birds to borderline cliff ahead of a Peregrine surging up around, rouses or shakes out her feath- murderous in others. The Maitland female and along the cliff-line. Wings pumping ers, then stretches out the right wing tops the list of maniacal mothers, and has hard in the cold, dead air, the falcon and leg together, followed by those on both the equipment and the temperament cuts across the ancient rocks and beats the left. The latter movements are slow to inflict serious damage. up towards the sun. and limber and afford me the chance 48 PEREGRINE FALCON AFRICA – BIRDS & BIRDING FEBRUARY/MARCH 2010 PEREGRINE FALCON 49 to inspect each of her tarsi through approaches she lowers her head still THE SEASON LIES the scope, as she moves them towards further and raises her tail invitingly. The BEFORE ME LIKE A the tips of her flexed wings. She carries pair copulate in a brief confusion of flut- both numbered SAFRING and coloured tering wings and wailing and chittering COMPLEX SOAPIE, aluminium rings on her legs, and the calls. Afterwards, the male circles the COMPLETE WITH colour combination (red/silver right and mast again and then lands near the top. SAFRING left) confirms that she is the Before he settles fully at the perch, I get from the remote rock-faces of Table maintenance is scheduled for before or Above A female Peregrine perched at EQUAL DOSES OF same bird that has occupied the Cape him in the scope to study him in detail. Mountain to stone quarries, palled in after the breeding season, or putting up her nest box on the cooling towers of the FATIGUE AND TEDIUM, Point territory for the previous six sea- Like her, he is colour-ringed, and is the dust, and grubby, condemned buildings nest boxes to encourage the birds to nest Athlone power station. Peregrines have sons. I ringed her as a nestling in a ter- six-year-old product of a territory about in industrial Cape Town. Each territory where they are safest and least likely to bred here since the author installed nest FASCINATION AND ritory more than 20 kilometres to the 18 kilometres away. presents unique challenges and each compromise human interests. boxes in 1989. The future of this site is EXHILARATION north and now, at eight years old, she is By just after 08h00 I have completed must be studied with a similar level of At the Red Cross War Memorial now in the balance, as municipal officials in her prime. my tasks for the morning at this, the detail if I am to develop and maintain Children’s Hospital in Rondebosch, the contemplate the demolition of the now- Having confirmed her identity, I can most southerly territory in my study a complete picture of how the popula- staff show plenty of interest in the disused towers and stacks. relax a little, watching her with the area. I have confirmed that it is still tion works. The pending season lies welfare of the resident Peregrines. Sister naked eye while I make a cup of coffee occupied by a pair of adults and that before me like a huge, complex soapie, Knobel is once again more than happy Opposite The Cape Point female pre- and update my notes. I have just enough they are the same individuals that were complete with equal doses of fatigue and to let me use her office window as an pares to take a freshly caught Common time for a much-needed hit of caffeine present in the previous season. Mission tedium, fascination and exhilaration. access point for the exterior of the Starling from her mate in a mid-air food before her casual demeanour changes. accomplished, I start walking back down ‘Here we go again,’ I mutter to myself building on the sixth floor. There are pass. Courtship feeding is a critical I revert to the scope as she turns and to the car park. as I put my vehicle in gear and drive two boxes at Red Cross, which I put up com ponent of the breeding cycle: the bows forward, her plumage clenched So begins my annual round of survey- north. a few years ago after the birds had tried frequency with which males provision tight, uttering a loud, rather strange, ing and monitoring Peregrine Falcon to nest behind an air-conditioning unit, females in July/August affects the ulti- grating call ‘Krrchuck…krrchuck…krr- nests on the Cape Peninsula. In a few without much success. mate success or failure of the season. chuck…’. Searching the sky ahead of her weeks’ time I will need to visit the The8 September breeding season is fully under way. As I inch up to the side of the nest with my binoculars, I pick up the male, cliff where this pair generally breeds, to I try to get clutch sizes and measure- box, which faces out into the hospital gliding in fast from the south-east. His determine whether they have laid and ments at a representative sample of 15 to car park, I talk quietly to the anticipated taut wings tear the air as he scorches are incubating a clutch of eggs. Then, 20 nests each year and need to get the occupant and then knock on the roof around and past me, his long-toed, if I can confirm a breeding attempt, I early-laying sites in the bag to stay ahead once I get there in an effort to alert the orange-yellow feet hanging slightly, his will have to make at least one more visit of the game. This means heading for the possibly incubating bird to my presence.