Nov 3-Birds Flashcards
What are Anseriformes?
Waterfowl
What are Falconiformes?
Most raptors-Falcons, eagles, etc.
Birds are ___thermic and ___thermic
Endothermic and homeothermic
Birds have lungs and ___
Lungs and air sacs
What kind of eggs?
Hard shelled with amniotic fluid
Birds evolved from what group of dinosaurs during what period?
Theropods during the Jurassic period
Feathers originally evolved for what?
Thermoregulation
Three main types of feathers?
Contour (for flight), down (insulation), and filoplumes (sensory roles)
What are the two feather categories?
Plumaceous-downy, fluffy
Pennaceous-linked vaned feathers
What is a calamus and rachis?
Calamus: hollow base of a feather shaft
Rachis: the rest of the shaft that supports the vanes
Down feathers have no ___
No rachis; barbules lack hooks resulting in fluff
What is a pygostyle?
Loss of tail; this supports the feathers
Crop:
Softens food and regulates flow
Proventriculus:
Secretes digestive enzymes
Gizzard:
Helps grind food
What format the triosseal canal?
The coracoid, scapula, and furcula
Avian respiratory systems have a _________ flow
Unidirectional; air coming in does not mix with air exiting
How do precocial birds hatch?
With feathers and eyes already open
How do altricial birds hatch?
With no feathers and eyes closed
What is DDT?
Thinned eggshells- increased nest failure
What are Passeriformes?
Song birds/perching birds- crows, robins, cardinals, etc.
