From the Derby Telegraph in England:
Derby Cathedral’s famous falcons lay their first egg
By Caroline Jones
Posted: March 29, 2015
It is the 10th year this pair of peregrines has nested on the 16th-century tower of the cathedral.
The egg was laid at 2.12pm today.
“The first egg this year is the 36th that the female has laid. We expect that she will lay a further three eggs to complete her clutch.”
He said: “Eggs are usually laid at about two day intervals and incubation, which will last 30-35 days, begins only when the clutch is complete.
“Peregrines don’t breed until they are at least two or three years old, so our pair are now over 12 years old. They certainly make excellent parents.
“They begin courting in February each year with the first egg being laid either in late March or early April. The earliest egg was laid on March 23 2010, the latest on April 4 2013. This year she has laid on the same day as she did last year”.