Just like fish dominate the underwater domain, birds are the rulers of the skies. The same properties of physics that have set airplanes aloft have also propelled birds for millennia. But aside from feathers and flight, how much do you really know about these winged creatures?
What characteristic makes birds unique?
ability to lay eggs
ability to fly
How many known species of birds exist?
What is a bird's keel?
the flat, outer surface of the breastbone
the spot where the mandibles connect
the total amount of vertebrae
What's the easiest way to tell the difference between wading birds and perching birds?
difference in wingspan
difference in body size
difference in foot anatomy
Which is not a difference between birds and other mammals?
presence of fingers (phalanges)
higher internal temperatures
Which of the following senses is weakest in birds?
What's the major difference between human and bird digestion?
Birds eat their food twice by regurgitating it.
Birds have two stomachs.
Human digestion takes longer.
Which type of flight is the least common among birds?