[EBB Sightings] Franklin's Gull pink coloration

--Apple-Mail-4--340205766
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
	charset=US-ASCII;
	format=flowed

Bob,

Thank you for pointing the way to the digest.

Franklin's Gulls have been reported eating crustaceans on occasion 
[Birds of North America]. The following paragraph from Joe Morlan's 
link to The Condor on the Digest was especially interesting:

"Most birds with a feather flush also display red coloration in the 
soft integument (legs, bill, combs) and have the capacity to deposit 
red keto-carotenoids. Among larids, the red, pink, orange, or yellow 
skin of the legs and feet of several gulls contain carotenoids 
(Lihnberg 1930, 1934). The available chemical evidence implies these 
birds can process carotenoids metabolically. Carotenoid pigments are 
not produced de novo in birds (see Brush 1981) but are obtained 
initially from the diet." [Carotenoids Produce Flush In The Elegant 
Tern Plumage by Jocelyn Hudon And Alan H. Brush]

Arlyn
Oakland


--Apple-Mail-4--340205766
Content-Transfer-Encoding: 7bit
Content-Type: text/enriched;
	charset=US-ASCII

Bob,


Thank you for pointing the way to the digest. 


Franklin's Gulls have been reported eating crustaceans on occasion
[Birds of North America]. The following paragraph from Joe Morlan's
link to The Condor on the Digest was
especially interesting:


"Most birds with a feather flush also display red coloration in the
soft integument (legs, bill, combs) and have the capacity to deposit
red keto-carotenoids. Among larids, the red, pink, orange, or yellow
skin of the legs and feet of several gulls contain carotenoids
(Lihnberg 1930, 1934). The available chemical evidence implies these
birds can process carotenoids metabolically. Carotenoid pigments are
not produced de novo in birds (see Brush 1981) but
are obtained initially from the diet." [Carotenoids
Produce Flush In The Elegant Tern Plumage by Jocelyn Hudon And Alan H.
Brush]



Oakland



--Apple-Mail-4--340205766--