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Beak sign

Beak sign

(Science: clinical sign) appearance of the distal oesophagus, on a contrast oesophagram, in achalasia; also used to describe the proximal pyloric canal on upper gi series in congenital pyloric stenosis.

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Lamarckism and the Honeyguide

... behaviour was controlled through the accumulation of 'simple' innate sign or cue triggers. For instance, Tinbergen found that gull chicks feed in response to the recognition of a red dot on their parents beak - they will even attempt to feed from a cardboard cutout as long as it ...

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by narrowstaircase
Sat Nov 04, 2006 7:24 am
Forum: Evolution
Topic: Lamarckism and the Honeyguide
Replies: 14
Views: 8289

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