Unfortunately, one of this year’s young peregrines died earlier this week following a collision with a building. The female PCA was found near Sainsburys, Ings Road and was cared for by Jean Thorpe, of Ryedale Wildlife Rehabilitation.
PCA being X-rayed
PCA was examined by Mark Naguib, a vet who has lots of experience in dealing with raptors. Mark found that the bird had dislocated an elbow joint at least 24 hours earlier. He tried to put the bones back into place but this proved to be impossible and the decision was taken to end the bird’s life whilst it was still under the anaesthetic.
The decision was not an easy one but it was based on the fact that peregrines rely so heavily on the use of their wings to hunt their prey. PCA would never again have been able to live freely and to hunt as a peregrine should.
Dislocated elbow joint
We are grateful to Jean and Mark for the time and effort that they have given to caring for PCA.
It’s always sad to hear of the death of a peregrine but we must stand back and look at the whole picture. The Wakefield peregrines have now fledged ten young. We know of four deaths, all caused by collisions, and this means that there are, potentially, six new peregrines out there somewhere. If fifty percent of young peregrines survive the first year, that should be considered to be a good result. In their lifetimes, our two adults need to produce only two new peregrines that go on to breed successfully to replace themselves. I think there is a good chance that they have succeeded in that task.
The 2017 season has been another successful one for the Wakefield peregrines. The same two adults have now bred on the cathedral in three successive years. This year, they had four eggs, with the female laying the first egg within two hours of the time when the first egg appeared last year. We believe that one egg was accidentally punctured by a talon and, as a result, only three of the four eggs hatched. The three young peregrines have been given orange rings with the codes PAA, PBA and PCA. PBA is the only male.
As usual, the adults did a good job of raising the youngsters. They fledged on a very windy weekend and ,as a result, there were a couple of mishaps. Instead of being able to spend time jumping up onto the wall above the box and running along the wall flapping their wings, the youngsters tended to get whisked away by the breeze and a couple found themselves down on the ground. The young male, PBA, was returned to the tower almost immediately but a female, PCA, landed late in the evening and was returned the next day, after a medical check organised by the people at Wise Owl Bird of Prey Rescue. PCA had a limp but no broken bones.
Juveniles PBA & PCA
All three of the youngster are now flying freely, putting on some good displays as they chase each other in the skies above Wakefield. As usual, they have chosen the roofs of the tower blocks as their favourite base.
These three youngster bring the total fledge since breeding began in Wakefield to ten. We look forward to hearing news of sightings of Wakefield birds in other cities at some time in the future.
This year’s clutch was completed with the laying of a fourth egg just after 3 a.m. on 1st April. The birds have, therefore, been incubating for a little over two weeks and they are well into their usual routine. The female incubates throughout the night and the male takes over for an hour or two early in the day. He usually returns to do another shift – often lasting 2 to 4 hours – in the afternoon.
Peregrines begin incubation with the laying of the penultimate egg, which was on Wednesday, 29th March. Last year, the first hatching was 34 days after the laying of the third egg. Using this as a guide, I would expect the first hatching this year to be on Tuesday, 2nd May. Factors such as the outside temperature can affect incubation time, so this date is only a guide and hatching could begin a day or two either side of this date.
The first three eggs should hatch very close to each other and the fourth egg should hatch a couple of days later.