Wed. April 23: During the third week of incubation for a pair of nesting Peregrine Falcons (around days 14–21 after the last egg is laid), several key things happen in the development of the eggs and in the daily behavior of the adult falcons. Here’s a summary focused on your pair north of Boston: Egg […]
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April 16, 2025: Egg Development (Week 2) – Rapid Embryonic Growth: The embryos begin developing visibly defined features such as limb buds, eyes, and a beating heart. By the end of this week, they start to resemble tiny birds. – Increased Metabolic Activity: Nutrient absorption from the yolk intensifies, and the demand for oxygen grows […]
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April 9, 2025: Egg Development (Week 1) – Fertilization and Cleavage: After each egg is laid (usually every 48 hours), early cell division begins within the blastodisc if fertilization was successful. – Embryo Formation: Around day 2, the embryonic disc starts differentiating into three germ layers (ectoderm, mesoderm, endoderm) which will form all tissues and […]
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March 25, 2025: News from the Lawrence Peregrine Nest! Throughout March 2025, Peregrine watchers on the New Balance falcon cam observed the resident female showing strong signs of egg-laying. Special thanks to our friends at New Balance for keeping the webcam running! She frequently visited the nest box, rearranging gravel, forming a nest bowl, and […]
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During the fourth week after hatching, peregrine falcon chicks (eyases) continue to undergo significant changes in preparation for fledging. Day 22-24: – Feather Development: By now, the chicks have a substantial amount of juvenile feathers, especially on their wings and back. The down feathers are mostly replaced by these juvenile feathers, which are darker and […]
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During the third week after hatching, peregrine falcon chicks (eyases) continue to experience significant physical and behavioral development. Day 15-17: Feather Development: The down feathers are gradually replaced by darker juvenile feathers, especially on the wings and back. These juvenile feathers are more streamlined and will eventually aid in flight. Increased Size: The chicks continue […]
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The growth and development of peregrine falcon chicks during the first two weeks after hatching are rapid and fascinating. Here’s a detailed overview: First Week (Days 1-7) Day 1-2: – Hatching:The chicks, known as eyases, hatch after about 33-35 days of incubation. They emerge from their eggs with the help of an egg tooth, a […]
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Mon. April 8, 2024 under clear skies, wind SW at 3MPH, and temp at 39F. Had a nice visit looking to get an update on the local peregrines with breeding season getting in full swing! After a full tour around the Ayer Mill Clock Tower, moved on to scout out other nearby regular perch locations. […]
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Hi, Craig! This site is spectacular! I am working with the 21 st Century program at the Wetherbee School doing a river study of the Merrimack. We took our students on their first barge ride yesterday up river and saw a red tail chasing a great blue heron, many hawks, geese, mallards, and other birds. A rainbow on the way back. I had no idea there were kestrels in the area, nor did I know of the peregrines. My brother ( Craig, also!) has a live video feed of a nest at the top of the Marriott in Boston. I’m wondering if you had time to come share your knowledge with our 3 rd and
4 th graders at the Wetherbee some day after school? If not, I’ll have them blog you on this site. Btw. I live in a lake in Tyngsboro and witnesses a pair if swans harassing some Canada geese this morning. Can they move! I could go on and on about our wildlife, but that’s for another day. Can’t wait to visit the rookery in NA. Thanks again for your site. Kate Oliver
I love this site..
I have added this page to my favorites and will check regularly
thanks!
Craig
Such a pleasure talking with you and seeing your incredible photos here! I will save this page to my favorites and check it every day !
Have a great day….
Linda