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?
Question 1 of 10
What characteristic makes birds unique?
Question 2 of 10
How many known species of birds exist?
Question 3 of 10
What is a bird's keel?
Question 4 of 10
What's the easiest way to tell the difference between wading birds and perching birds?
Question 5 of 10
Which is not a difference between birds and other mammals?
Question 6 of 10
Which of the following senses is weakest in birds?
Question 7 of 10
What's the major difference between human and bird digestion?
Question 8 of 10
Which type of flight is the least common among birds?
Question 9 of 10
Which of the following is not a flightless bird?
Question 10 of 10