Catnip can affect lions and tigers as well as house cats. It excites them because it contains a chemical that resembles an excretion of the dominant female's __________
Within the hawk, or birds of prey, family, there are __________ species _ eagles, hawks, kites, and Old World vultures, which are found nearly worldwide.
A __________ has no color vision, it sees only in black and white. Every part of its field of vision, however, is in perfect focus, not just straight ahead, as with humans.