Norfolk Botanical Garden Eagles

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 Post subject: Eagle Terminology
PostPosted: Fri Jul 10, 2009 12:26 pm 
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The U.S. Fish and Wildlife Service has developed or included the following definitions in response to requests and recommendations for clarification of terms.

http://www.fws.gov/migratorybirds/balde ... 7Aug08.pdf

p. 23

Adult - an individual eagle capable of breeding
Breeder - an adult eagle that defends a breeding territory
Cohort - for purposes of the models used in the DEA, eagles of the same species born in the same year.
Fledgling - a juvenile eagle that has taken the first flight from the nest but is not yet independent.
Floater - an adult or subadult eagle without a breeding territory
Juvenile - an individual eagle less than 1 year old.
Nestling - an individual eagle between the time of hatching and the time it takes the first flight from the nest.
Productivity - the mean number of individuals fledged per occupied nest annually.
Subadult - an individual eagle greater than 1 year old, but typically not able to breed.

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For the animals shall not be measured by man ~ They are not our brethren, they are not underlings: they are other nations, caught with ourselves in the net of life and time, fellow prisoners of the splendor and travail of the earth ~ Henry Beston


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PostPosted: Fri Jul 10, 2009 4:30 pm 
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Additional eagle terms shared by Reese Lukei, CCB Researcher.


I have not heard or seen the terms breeder or floater used - unusual terms

Immature - General term for any plumage and/or age that is less than adult

Hatch year (HY) - any bird within its first year

After first year (AHY) - a bird after first year (there are other terms like SY - second year, etc

Adult - The final breeding plumage, also called definitive basic plumage

Juvenile (sometimes spelled juvenal) - Young raptor that is fully grown and self-sufficient

Juvenile plumage usually one year on most raptors can on eagles be retained more than one year

Subadult - any plumage more than one year - used synonymously with "basic" In eagles who take 5 years to reach adult plumage it goes like this
Juvenile
Basic I (subadult I
Basic II (subadult II
Basic III (subadult III
Adult

Hope this helps
Reese

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For the animals shall not be measured by man ~ They are not our brethren, they are not underlings: they are other nations, caught with ourselves in the net of life and time, fellow prisoners of the splendor and travail of the earth ~ Henry Beston


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 Post subject: Re: Eagle Terminology
PostPosted: Wed Jun 09, 2010 2:01 pm 
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Reese Lukei shared these additional terms with his recent class.

JUVENALE - Refers to the first plumage attained after its natal down. Eagles retain for one year.

JUVENILE - A bird wearing its juvenale body feathers. An eagles first year.

IMMATURE - General term for any plumage or age less than an adult.

FLEDGLING - Young eagle that has left the nest but is still being fed by its parents. About six to eight weeks.

PLUMAGE - An eagle's entire feather coat.

DEFINITIVE PLUMAGE - Any mature plumage after all immature plumages.

CONTOUR FEATHERS - The outer coat of feathers of the body, wings, and tail.

RECTRICES - Tail feathers - eagles have 12.

REMIGES - The long flight feathers of the wings.

PRIMARIES - The 10 stiff feathers of the outer part (the hand) of the wing.

SECONDARIES - The 17 stiff feathers of the inner part (forearm) of the wing.

FINGERS - Outermost five to seven primaries.

DIURNAL - Active during the daylight hours.

CREPUSCULAR - Active at dawn and dusk.

WING LOAD - The relationship between the surface area of the wings and a bird's weight. Eagle's have low wing loading.

_________________
For the animals shall not be measured by man ~ They are not our brethren, they are not underlings: they are other nations, caught with ourselves in the net of life and time, fellow prisoners of the splendor and travail of the earth ~ Henry Beston


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 Post subject: Re: Eagle Terminology
PostPosted: Fri Jan 27, 2012 12:53 pm 
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Another site I found that I thought worth sharing.
Raptor & Falconry Terminology

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For the animals shall not be measured by man ~ They are not our brethren, they are not underlings: they are other nations, caught with ourselves in the net of life and time, fellow prisoners of the splendor and travail of the earth ~ Henry Beston


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