Ornithology 1-5

What is the difference between precocial and altricial young?

• Precocial young are born with closed eyes and down. They can leave the nest within 2 days of hatching. Altricial young are born with open eyes and no down. They rely on parents for survival. All passerines are altricial.

• Precocial young are born with open eyes and no down. They are capable of leaving the nest within 2 days of hatching. Altricial young are born with closed eyes and down. They rely on parents for survival.

• Altricial young are born with closed eyes and no down. They are capable of leaving the nest within 2 days of hatching. Precocial young are born with open eyes and down. They rely on parents for survival.

• Precocial young are born with open eyes and down. They are capable of leaving the nest within 2 days of hatching. Altricial young are born with closed eyes and no down. They rely on parents for survival. All passerines are altricial.

A unique adaptation in the avian eye that contains its blood vessels

• iris
• retina
• pecten
• lens

Some birds have two of these to enhance their visual sharpness (acuity)

• cornea
• retina
• fovea
• pecten

The bone of the middle ear in birds

• stapes
• columella
• pecten
• incus

Birds inhale by lowering their ___________, which enlarges their chest cavity and expands air sacs

• sternum
• diaphragm
• cloaca
• lungs

On average, birds have how many air sacs?

• 0
• 2
• 9
• 15

To lose heat birds will

• wet their abdomen
• tuck their bill under their scapula
• fluff their feathers
• reduce exposure of their legs

What is the purpose of lobed feet?

• They allow crocodiles to walk across marshes by increasing surface area, but provide less foot maneuverability than webbing.

• They allow birds to fly across marshes by decreasing surface area, but provide less foot maneuverability than webbing.

• They allow birds to walk across deserts by decreasing surface area, but provide more toe maneuverability than webbing.

• They allow birds to walk across marshes by increasing surface area, but provides more toe maneuverability than webbing. Coots and Grebes have lobed feet.

The Black-Bellied Whistling Duck is identified as...

• 
• Anseriformes, Anatidae

• Dendrocygna autumnalis

• All of the above

The wishbone

• furcula
• tibiotarsus
• ischium
• carpometacarpus