The Project > Ask the Peregrine Chick

Chicks, Eyasses, Juveniles?

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Kinderchick:
Thank you for taking the time to post this information, TPC. Very interesting and very clearly stated.  :) The Gr. 1 & 2 teachers at my school are also following the Radisson falcon chicks and although they are not registered members of the forum, they often ask me questions and this is one that they have also wondered about.

Saoirse:
General or not, TPC, these definitions are a lot clearer than anything I came across when I went searching! Thanks a million.  :)

The Peregrine Chick:
These are general rules, not hard and fast in my experience ...

Chick - nestling - hatch to fledge age.

Eyas - same as a chick, not used so much by biologists in my experience and not a term I use.  Sort of like tiercel and falcon for male and female, terms that require explanation when they are used.

Fledgling - when chick takes first flight (fledge) so they are now fledglings; remain fledglings until they have the whole flying thing undercontrol, then usually shift into being juveniles.

Juvenile - usually used when birds are more independent - hunting, roosting, moving further afield.

Young - also a term for the offspring of a year, can be of any age - chick, fledgling, juvenile.

Immature - term that gets used for birds that are after hatch year (January onward) in age but who are still behaving like juveniles i.e., begging for food from adults

Sub-adult - young non-breeding peregrine, may show some juvenile plumage or may not, behaviour is adult, but not breeding due to age.  Some just call them non-breeding adults.

Adult - old enough to breed, may or may not be breeding or have bred.


Or at least this is how we use them ...

Kinderchick:
Thanks, Saorise... but then, when does a chick or an eyasses become a fledgling and a juvie, I wonder? ???

Saoirse:

--- Quote from: Kinderchick on June 08, 2010, 20:49 ---At what point in their development do they then become known as "juveniles" or "juvies"? ???

--- End quote ---

Kinderchick, this is something I wondered, too. According to one definition I just found, an eyass is a fledgling who has not yet left the nest. There may be more to it than that, but that's as far as the definition went!

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