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Western gull


The western gull (Larus occidentalis) is a large white-headed gull that lives on the west coast of ... Despite being a well-known bird species on the West Coast of the US, it is of some ... It has a...

Why Do Gulls Have a Red Spot on Their Bills? | Audubon


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.

Herring Gull - | The Wildlife Trusts


Swooping in and stealing your chips, the herring gull is the 'typical seagull' and is a ... This red spot spurred one of the classic studies in animal behaviour in the 1950s, ... Having seen gull chicks peck at their parents' bills to encourage them to  ...

Pecking the Red Dot: Herring Gull Myth or Fiction? - Acronym ...


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 ...

Classic behavioural studies flawed : Nature News


Mar 24, 2009 ... Nobel prizewinner took short cuts to show that the way gulls feed is ... Herring gull chicks instinctively peck at red spots on their parents' bills to beg for food. ... idea in animal behaviour was that learning was all-important.

Identification Keys and Tips - "Typical" Gulls


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.

Ring-billed Gull, Identification, All About Birds - Cornell Lab of ...


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 Gull, Identification, All About Birds - Cornell Lab of Ornithology


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 ...

Identification of Pacific Northwest Gulls · University of Puget Sound


Comments on Identification of Certain Adult Gulls of the Pacific Northwest .... Larger gulls have relatively thicker bills, an important aid in judging size, especially ... Caution: All of the larger gulls with red bill spots, as their bill changes color with ...

Oil pollution increases plasma antioxidants but reduces coloration in ...


The red bill spot was significantly smaller (16%) in the oil-fed gulls than in ... 2008a), indicating that oxidative stress plays a key role in regulating such coloration.

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Some species of gulls have uniformly coloured bills, but many. (62% of the species in ... (i.e. a red tip or spot), whereas smaller-billed species have uniform bills. We therefore ... The importance of taking phylogenetic effects into account during.

Seagull's red dot? (Page 1) - Birds - Ask a Biologist Q&A


As I understand, it is used during feeding nestlings. The chicks peck at the red dot and stimulate the parent to regurgitate some delicious ...

Seagull facts and information - Steven P. Wickstrom website


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 ...