The red-billed gull (Chroicocephalus scopulinus), once also known as the
mackerel gull, is a ... Juvenile gulls have a dark brown bill with only hints of red,
making them difficult to ... The legs a...
Oct 7, 2013 ... This story comes to you through a partnership between Audubon and BirdNote, a
show that airs daily on public radio stations nationwide.
The word Laridae is from the Greek word meaning “ravenous sea bird.” The term
.... The bill is yellow with a red spot near the tip of the lower mandible. The back ...
Mar 26, 2009 ... Tinenberg found that the baby gulls will peck at a red spot more ... "One of
Nikolaas Tinbergen's most important contributions is that he has ...
Keys and Tips for Identifying "Typical" Gulls - Differentiating between Ring-billed,
California, ... in the winter can attract significant numbers of gulls, including the
rarities shown on this page. ... Bill: Yellow, with black and red spots on lower bill.
Mar 24, 2009 ... Nobel prizewinner took short cuts to show that the way gulls feed is instinctive. ...
At the time, the dominant idea in animal behaviour was that learning was all-
important. ... Adult gulls have a red spot on their lower bill.
Familiar acrobats of the air, Ring-billed Gulls nimbly pluck tossed tidbits from on
high. ... look closely, as some other species have black or red spots on the bill.
Herring Gulls are large gulls with hefty bills and robust bodies. ... with long yellow
bill; Gray back, bright white head and underparts; Red spot near tip of lower bill ...
Apr 3, 2013 ... Gulls are among the world's most successful species. ... given day, at any time of
year, they are likely to be present in significant numbers. ... The smaller gulls
have thin bills, without the red spot, ideal for picking out small prey.
www.whatbird.com/browse/objs/All/birds_na_147/59/Family/11106/Gulls, Terns, Skimmers (Laridae)/default.aspx
Birds of North America of the Gulls, Terns, Skimmers (laridae) Family. ... Bill is
yellow with a red spot near tip; eyes are yellow-gray with red orbital rings; legs