Lawrence Peregrines: Day 11

May 15, 2019 in In the Nest Box, lawrence peregrines

The Peregrines started today with a forecast that calls for isolated showers before 7am. Mostly cloudy, with a high near 61. Northwest wind 3 to 8 mph. Chance of precipitation is 20%. Tonight, scattered showers, mainly after 1am. Mostly cloudy, with a low around 46. Light and variable wind. Chance of precipitation is 50%. 

2019.0515.2By day 11, the beak is already beginning to acquire a slightly yellow tinge, as opposed to the pink color it has had to this point in the chick’s development.  In regard to feeding behavior, hungry chicks solicit even if the adult arrives without food, but when satiated they remain indifferent. R. W. Nelson observed that chicks tend to form a semi-circle in front of the parent or to one side and all received portions of the prey item. Another researcher found that each chick was fed in turn until satiated, when it dropped back and was replaced by the next in line. After 10-12 days, chicks which called most received the most food


Literature cited:

Ratcliffe, D. 1993. The Peregrine Falcon. 2nd ed. Carlton, England: T. and A. D. Poyser.

The Canadian Peregrine Foundation, Peregrine Falcon Development – Age Guide;