Fourth Egg for Bath Peregrines

Not to be outdone by their Norwich Cathedral counterparts the St John’s Church peregrines have produced a fourth egg – to the delight of the Bath team and the wider online audience.

At 08:00 on 31 March, the fourth egg of the 2015 breeding season was laid at Bath. It was observed that the falcon commenced full incubation on the laying of the 3rd egg on the 29th, so assuming an incubation period of 33 to 35 days from the third egg, we have a prediction of 1 to 3 May for the first egg to hatch. However, nothing is certain with this process so watch this space.”

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Fourth egg laid at 8.00am Wednesday 1 April 2015

Time between eggs:
1st to 2nd = 57 hours | 2nd to 3rd = 57 hours | 3rd to 4th = 57.5 hours – nice to be regular!

3 Responses to Fourth Egg for Bath Peregrines

  1. she seems to deliberately exclude one of the eggs from being incubated – is this deliberate or inexperience. The egg is excluded even when the bird changes position in the box. I have observed this for the past 4 hours so it seems deliberate.

    • Susie

      There were two periods on the 14th when an egg was inadvertently ‘lost’ from under the incubating bird. On one occasion around midday the falcon was turning and an egg was pushed out, and on another at about 14:20 the tiercel took over incubation and failed to cover all four eggs; essentially because he is so small. On each occasion it was a different egg, and on both occasions the egg was ‘recovered’ in under an hour. The weather was very warm in Bath on that day so the risk was reduced. Records at Norwich show eggs as having been left for longer periods last year while intruders were being dispatched and all four subsequently hatched. In essence, this is not an unusual occurrence but its impact at Bath will be extremely difficult to gauge if the normal low hatch rate at that nest persists this year. Many thanks for drawing this to our attention.

  2. The falcon commenced full incubation on the laying of the 3rd egg on the 29th of March, so assuming an incubation period of 33 to 35 days from the third egg, we have a prediction of 1 to 3 May for the first egg to hatch. However, nothing is certain with this process so watch this space.

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