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Crest (bird)

 
Crest (bird)

 
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Crest (bird)
 
 
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The crest is a prominent feature exhibited by several bird
Bird

Birds are wing, Bipedalismal, endothermic , vertebrate animals that lay egg . There are around 10,000 living species, making them the most numerous tetrapod vertebrates....
 and dinosaur
Dinosaur

Dinosaurs were the dominant vertebrate animals of Landform ecosystems for over 160 million years, from the late Triassic Period until the end of the Cretaceous Period , when most of them became extinct in the Cretaceous?Tertiary extinction event....
 species on their heads. Fleshy crests are called cockscombs; this article discusses feather crests.

Generally used for display
Display (zoology)

Display is a form of Ethology, linked to survival of the species in various ways. Some species use display as a form of courtship, with the male usually having a striking feature that is distinguished by colour, shape or size, used to attract a female....
 purposes, crests can be fixed or erectile, depending on the species.






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The crest is a prominent feature exhibited by several bird
Bird

Birds are wing, Bipedalismal, endothermic , vertebrate animals that lay egg . There are around 10,000 living species, making them the most numerous tetrapod vertebrates....
 and dinosaur
Dinosaur

Dinosaurs were the dominant vertebrate animals of Landform ecosystems for over 160 million years, from the late Triassic Period until the end of the Cretaceous Period , when most of them became extinct in the Cretaceous?Tertiary extinction event....
 species on their heads. Fleshy crests are called cockscombs; this article discusses feather crests.

Generally used for display
Display (zoology)

Display is a form of Ethology, linked to survival of the species in various ways. Some species use display as a form of courtship, with the male usually having a striking feature that is distinguished by colour, shape or size, used to attract a female....
 purposes, crests can be fixed or erectile, depending on the species. For example, Cockatoo
Cockatoo

A cockatoo is any of the 21 bird species belonging to the family Cacatuidae. Along with the Psittacidae family and the Nestoridae family, they make up the order Psittaciformes....
s and cockatiel
Cockatiel

The Cockatiel , also known as the Quarrion and the Weiro, is the smallest and genuinely miniature cockatoo Endemism in birds to Australia....
s possess crests which may be raised or lowered at will. Their crests are used to communicate with fellow members of their species, or as a form of defence to frighten away other species that approach too closely.

The crest is made up of semiplume feathers: a long rachis
Rachis

The rachis is the main axis of the inflorescence, or spike, of wheat and other cereals, to which the spikelets are attached. It is also the part of the axis that the pinnae are attached to in ferns, the main stem of a compound leaf , or the main axis in compound inflorescences in other angiosperms....
 with barbs on either side. These are plumulaceous feathers, meaning that they are soft and bendable. In birds, these semiplumes are common along the head, neck, and upper back, and may be used for buoyancy and sensing vibrations.

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