Author: davidwoodsbsg

Summer sign-off

Six weeks on from the fledging of the juvs, the new colour rings are proving their value, allowing easy identification of their coming and goings.

The pictures above show the ringing on May 18th, the three juvs ringed with silver BTO rings and the orange plastic rings labelled PRF, PSF and PTF respectively.  Since they fledged, there have been various sightings of PRF and PTF, but none reported of PSF.

Juv PTF Aug 6 2017

Both PRF and PTF have continued to visit the nest platform at St George’s on a regular basis, roosting there quite often and receiving food drops from one or other of the parents, which seem to be fully tolerant of their presence.  On the basis of some of the other urban sites monitored by webcams, this is not typical, and does not follow the pattern of previous years in Sheffield, where the juvs have dispersed from St George’s within a few weeks of fledging.

When the chicks were ringed, PSF was a little smaller than its two siblings, in wing length as in tarsus length.  With no subsequent confirmed sightings, it may be that it has succumbed to illness or infection, or perhaps it has move further afield: fingers crossed for the latter, although mortality rates are high, at around 60-70% in the first year.   About half of those that do not survive are thought to die from infectious disease, parasitism or other organic diseases.  Known causes of death include trichomoniasis (better known for killing large numbers of Greenfinches and other finches), botulism and myiasis (fly maggot infestation).

On a happier note, an early morning visit to St George’s revealed the male and PTF to be present.  They were content to sit unmoved, even when a couple of Feral Pigeons decided to land either side of the nest platform.

PGs and pigeons Aug 6 2017

One of them then took off and flew right in front of the male, landing on the turret opposite.  Even then he showed no sign of action beyond an interested stare.

PG male and pigeon Aug 6 2017

PG male and pigeon Aug 6 2017 2

So two of the Sheffield juvs are doing well, and if anyone has any sightings of PSF (as well as of PRF and PTF) do please share them, either via the twitter feed or by e-mail to chairman@sbsg.org

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First Flight!

Friday night’s public talk, attended by some 140-150 people, was great, with very informative contributions from Dean Rea (Sorby Breck Ringing Group) and Deborah Dawson and Natalie dos Remedios (Dept of Animal and Plant Sciences her at Sheffield University).  Dean explained the thinking behind the colour ringing of the young birds this year (details to follow) and Natalie’s finale was to reveal that all three of this year’s young birds are… male! So that makes three years of males only.

The weather ahead of the talk was damp and far from ideal for watching the birds, let alone for them to make their first flights, although a good crowd enjoyed fine views of the birds through the telescope available.  On Thursday evening (1st June) a trip to St George’s proved exciting, with plenty of activity.  Most notable was the female’s visit to the church tower with some prey that she brought to the corner of the ledge a couple of metres from the nest platform (in the photo below), but did not take into the box.  She seemed to be clearly trying to encourage the young birds to move beyond the nest, but despite their loud protests and obvious desire to reach the food, they did not budge!

June 1 no feed

Yesterday (Saturday) evening was fine and sunny so a visit to check on progress seemed in order.  The three juvs were very active on and around the box, with two of them ably going up on to its roof and one flapping/ hopping out onto the webcam housing.

June 3 flapping

There’s obviously not much room on top of the box, and the more adventurous juv clambered over its brother en route to the webcam housing: those talons must have been uncomfortable!

June 3 clambering

Both adult birds were close to hand, with all five on and around the nest site on occasion.  The female landed on the webcam at one point, and when she dropped away there was a sense of the juvs watching and learning.

June 3 all 5

The amount of downforce generated by the vigorous flapping undertaken by the young birds as they exercise ahead of their first flight was apparent when one gave it a good go on the edge of the box, raising a cloud of down (which they are rapidly losing completely) and small feathers, some presumably from inside the box.

June 3 feathers flying

By the end of the evening, the moon rose behind the tower and provided a photo opp that was too good to resist as the birds settled down for the night.

June 3 moon

This afternoon, one of the juvs was on the corner of the ledge having made its first excursion from the nest.

June 4 one on ledge

And this evening, news from Andy J that one of the juvs hopped/ flapped up onto the castellations behind the box, only to slip down and take flight, circling the tower and landing back on the roof in reasonably controlled fashion.  So we have lift off!!

 

 

Friday 2nd June

This Friday is a day of a definite and a possible: the definite is the Peregrine talk at St George’s from 7-8 (p.m.!), with contributions from Dr Deborah Dawson and Dr Natalie dos Remedios (Animal and Plant Sciences at the University of Sheffield), Dr Dean Rea (Sorby Breck Ringing Group) and Professor David Wood (Sheffield Bird Study Group).  We will cover the different key aspects behind the Peregrine project, and from 6:00 p.m. there will be telescopes on hand for the chance to watch the Peregrines and ask questions.

May 29 1

The possible is the young birds taking their first venture out of the nest, which is expected over next weekend, but could come on Friday.  As is apparent in the picture above (and can now be seen when watching from below), they are giving their wings some good exercise, building up their flight muscles ahead of the big day.  With less than a week to go until then, the young birds are taking an increasing interest in the world around them, and life beyond the nest platform.

It never fails to amaze how quickly they transform from essentially white and fluffy ‘squatters’ to scruffy versions of their parents in terms of overall appearance.  The screengrab on the left was from May 25th, and just four days later their feathers have continued to grow through the down, which is also being plucked out as they preen.

May 29 5

However, they still look very un-adult like when they huddle together to rest, lying flat with their heads down.  If you didn’t know there were three Peregrine chicks in the nest, working out what that pile in the corner is could be quite a puzzle!

May 29 6

By Friday most of the remaining white down will have been lost or pulled out and the young birds may well be flapping their wings on the edge of the nest, making us wonder if they’re about to go…

Hope you can join us on Friday, and spread the word!

 

Four Weeks Old

Today marks four weeks since the first chick hatched, and the three young birds continue to grow and develop well.  As is always the case at this stage, they are changing their appearance rapidly as their feathers grow through.

May 25 4 weeks

They will carry on changing over the next 10 days before leaving the nest, which may even coincide with next Friday’s talk in St George’s church.  It’s hard to believe it’s that close given how they look at present, but the down will soon be lost, they will stand (rather than rest on their ‘ankles’) and start to exercise their wings with increasing regularity and vigour.

May 24 night feed

The screengrab above shows one of the feeding sessions and the poor quality is explained by the time it was taken – 10:15 p.m.!  This is unusually late in the day for the Sheffield pair, which was not observed to engage in night feeding in the extensive footage that Esther Kettel reviewed as part of her PhD, though some pairs did (as she reported in the Journal of Raptor Research).  A couple of minutes later, the webcam switched to its night mode, almost exactly an hour after sunset, so perhaps we can count this as a night feed for the St George’s pair.  Unfortunately, I couldn’t make out the prey, as Peregrines are known to take bats!  For an urban pair, the presence of city lights may provide additional opportunities to hunt at night, thought there has been little evidence of this here in Sheffield.

May 24 night feed 2

Perhaps worth keeping an eye out for any further examples of this uncommon behaviour if you find yourself suffering from insomnia!  And a couple of minutes later again, the female hopped out onto the perch and the chicks settled back down for the night.

May 24 night

 

 

Ringing the changes and a diary date

With the chicks now in the ideal window for ringing, this morning’s good forecast provided the perfect opportunity to ring the chicks.  It’s always a slightly nervy time, but thanks to the expertise of our friends from Sorby Breck Ringing Group, very ably led by Steve (who has the necessary license to ring Peregrines), everything passed off very safely and smoothly.  Also important is the collaboration of colleagues in the University’s Estates Department, with special mention to Phil R and Steve H for their part in making it possible for this to take place.

May 18 ringing 2

In addition to Steve, Dean and Simon (the intrepid climber who goes over the wall to gather the chicks from the nest, securely roped of course), in picture above is Natalie from the University’s Department of Animal and Plant Sciences, who gathered material for analysis in their laboratories.  This is part of the developing involvement of the team there, who are contributing to our understandings of the birds both locally and within the national context.  As well as collecting pellets and faecal samples, we also took swabs to enable DNA analysis (as below), which will hopefully serve various purposes.

May 18 ringing swab

As the chicks were being processed for ringing, Steve took a series of detailed measurements, recorded by Natalie, that will help to build the picture for Peregrine chicks, for which there are few data nationally.

May 18 ringing 3

Another innovation this year was to fit unique colour rings to the chicks, which will make it possible to track their individual movements after they leave the nest, and potentially leave Sheffield.  Details of the identifying features of the rings to follow!

May 18 ringing

Being able to do this is a direct result of the funding raised through the kind donations to the Peregrine project; do please keep the donations coming so that we can do as much as possible with the material gathered today and taken to the labs for analysis.

May 18 ringing 5

As ever, the only downside to this is the brief disturbance caused to the adult birds.  Both were in the vicinity throughout, and while the male circled at quite a distance the female circled the tower, calling frequently.

May 18 4

May 18 3

The up side was seeing how some local residents came across to check what was happening, concerned at the disturbance to the birds.  It really is terrific to know that people in the area have taken the birds to heart and look out for them.  By the time we got back down to the bottom of the tower, the female was back on the nest and things quickly settled down to normal again.

May 18 5

With the webcams switched back on the chicks are now sporting their BTO silver rings and the colour rings, which will be more visible when they begin to stand, rather than shuffle as the do at present.  That will be one of the next developmental steps, as will the appearance of their feathers, which you can occasionally already see starting to come through when they move around or stretch in the nest.

And the diary date?  On Friday 2nd June we’ll be having a public talk on the Peregrines in St George’s from 7:00-8:00, when we aim to be able to share some of the findings from the data and materials collected today.  That will also be very close to the date that the chicks take their first flight, so from 6:00 there will be the chance to see the birds from the church grounds through telescopes and binoculars, and to ask questions.  Hope to see you there!

May 18 8

 

 

 

 

Two weeks old and another milestone

With two weeks having now passed since the chicks hatched, they continue to make good progress and are growing rapidly, as the comparison below demonstrates.

Although the chicks still look much the same in terms of their colour, they are now large enough to start to be left unbrooded for short spells, although one or both of the adults is always in the vicinity, even if not visible on the webcams.  Indeed, the male seems to have taken quite a liking to perching on the ledge where the second webcam mounting meets the wall, so out of sight, even if he can see the camera quite clearly.

PG May 13 male

Over the next week and beyond, the chicks will increasingly be left (apparently) unattended during the day and this is nothing to worry about.

A visit on Saturday morning saw plenty of activity as the female also made good use of the webcam mount after leaving the nest following a feed for the chicks, as in the sequence below.

PG May 13

PG May 13 fem to land

PG May 13 on camera

PG May 13 cleaning

The camera mounting appeared to be the perfect perch on which to clean her bill and talons.  Occasionally, this camera is obscured by a tail as one of the adults perches on it!  Once all clean to her satisfaction, she returned to the perch while the male kept watch from just below on one of the corners, again out of sight of webcams.

PG May 13 pair

There’s been no sign of the chicks from below as yet, but it won’t be long before they start to take an interest in the world beyond the nest platform and start peeping out.  As ever, it was a thrill to watch them come and go, offering some great flight views as they passed overhead.

PG May 13 3

PG May 13 2

PG May 13 fem

The other milestone is that donations to the Peregrine project have now passed the £1,500 mark (including gift aid), which is terrific and will allow us undertake activities that will enable us to learn more about this pair and their chicks.  Many thanks to all those who’ve made a donation – we really do appreciate it; and if you’re considering making a donation to support the project, please do so: the more funds we have, the more we’ll be able to do to discover the science behind these magnificent birds.

One week old

Since the three chicks hatched just over a week ago, all has been going well, with regular feeds and constant attention from the adults to keep them warm from a decidedly chilly northerly/ north-easterly wind coming into the nest platform.  As feared, the fourth egg won’t be hatching and is starting to be pushed aside at times.  We’ll look to recover it for analysis when the chicks are ringed at around three weeks old.

The comparison above allows is to appreciate just how quickly the chicks are growing.  There’s a little bit of a ‘Father Ted’ effect in the image on the right, as it’s a little more cropped, so the chicks in the image on the left are further away, but they’re also a lot smaller!  As they stretch their wings now you can start to see the beginnings of the feather shafts on occasion, and they will become increasingly obvious.

A visit to St George’s yesterday morning produced something I’d never witnessed before – a food pass between the adults.  The male was plucking some prey (another Feral Pigeon) on the ledge of the church and – after much calling – took off…

PG May 6 male takeoff

He then circled above the platform to let the female know what he had, enticing her off the nest to chase him, take the prey and return to feed the chicks.

PG May 6 with prey

The male also saw off a Crow and a Lesser Black-backed Gull that came too close for his comfort, popped into the nest to check up on things and then dropped away again.

PG May 6 male drop

So, plenty to see if you visit St George’s, with regular activity.  The week ahead should see more of the same: regular feeds, rapid growth and attentive parenting.