Adult & Chick Sexual Size Differences

My measurements show that the bald eagles in our area, southern British Columbia, generally weigh between 5 and 12 pounds (closer average 7 – 11 pounds) . When I repeat this to my Alaskan colleagues they point out they have caught several 13 pound birds. And I...

Bald Eagle Nestling Age Classes

Bald Eagle Nestling Age Classes By: David Hancock: Bald Eagle Biologist Bald Eagle Nestling Age Classes: (Waiting for DH photos) Chicks- Colour/Size and Estimated Age ====================================== Class 1. White and Small. Never left alone for more than 2-3...

When Do the Salmon Run?

When they’re chased!  When not swimming! The Pacific Salmon spawn is highly variable, depending upon individual historic timing for a stream, the species and the geographic location.  Still not much help! In general terms the earliest salmon runs are in the...

Annual Migration

The Annual Movements and Migration of Bald Eagles — a Quick Overview Some researchers don’t consider all bald eagle populations as migratory. Some of the eastern populations, and maybe a few others, basically disperse north after the breeding season,...

Post Fledging Support of Juveniles by Adults

In the wilderness areas in the 1960’s my studies showed that the adults first quit  bringing food to the nest about the 12th week.  After 2-4 days most of the young then fledged — often flying off to land on the beach where the adults could be seen...

Eagle Eggs: when and how they develop

The question has come up from recent observations:  “Does egg laying immediately follow mating?” Simply put — No!  But of course we are dealing with live creatures so variability is expected.   As many people have now observed many of our bald eagles...