Oberhausen 29 days old

Look at this qute little fellow. More advanced in his development than both his sisters. He is almost in his juvenile plumage. His sisters however are still covered in down. They have a lot more growing to do than male juvi's. The weight difference between male and female peregrines is about 250 gram. One third or "ein terzel" as the german word says. That is where the "tiercel" comes from, the name often used for male peregrines. The name for a female peregrine is falcon.