Re: Roseate Terns at Marathon

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Posted by John Boyd on 18:26:48 06/29/04

In Reply to: Roseate Terns at Marathon posted by Blake Mathys

The red is an indicator of health and also varies regionally. I'll just quote from Olsen & Larsson's "Terns of Europe and North America"

"Red is acquired in Europe/North America from (mid May) early June, after completion of egg laying. Red bill base is broadest (50-60% of bill; black tip 17-35mm: west Europe) from brood-feeding period until leaving the breeding site. Birds in best condition acquire the most red."

and

"Nominate dougallii from the West Indies generally have broader red bill base in the breeding season from late May...Red can cover the inner two-thirds of the bill during the brooding season."

Follow Ups:

• Re: Roseate Terns at Marathon - Vince 22:53:18 06/29/04 (4)
  • Re: Roseate Terns at Marathon - Nancy Fawcett 22:41:39 07/31/04 (0)
  • Re: Roseate Terns at Marathon - Alex 12:13:04 06/30/04 (1)
    • Re: Roseate Terns at Marathon - Steve 12:38:45 06/30/04 (0)
  • Re: Roseate Terns at Marathon - John Boyd 07:57:55 06/30/04 (0)

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