Chapter 21: Birds

First bird:

• Crow

• Archaeopteryx

• P. meyeri

• Bluejay

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Which of these is not evidence that suggests birds evolve from reptiles?

• Birds have scales on their legs and feet similar to those of reptiles

• Birds and Reptiles have similar diets

• Birds and reptiles show similar skeletal anatomy

• feathers are modified scales

• birds are egg layers similar to most reptile species

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Contour Feathers

• Assist in thermoregulation

• Assists in flight

• Give the bird color

• Give the bird its outward form

Flight Feathers:

• Primary and secondary flight feathers

• Contour feathers that extend beyond the body to assist in flight

• Second naame for filoplume feathers

• Assist in thermoregulation

Down Feathers:

• Assist in thermoregulation

• Give bird its outward form

• Located under contour feathers to conserve heat

• Short, hair like feathers

Filoplume Feathers:

• Secondary flight feathers

• Located under contour feathers to assist in thermoregulation

• Primary flight feathers

• Short, hairlike feathers to assist in sensory function and serve as insulation

Powder-down feathers

• Have tips that break down as they mature

• Produce a talc-like powder to provide waterproofing and luster

• Found on parrots and cackatoos only

• All of the above

The _____ of birds for a large, thin keel to provide foundation for attachment a bird's powerful flight muscles.

Many of the bones that make up the ____ and neck are fused together and several fo the rib bones are fused to the vertebra. This provides a strong, rigid structure necessary for flight.

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The ___ of the bird have been modified into wings.