Define diurnal and give an example of a mammal that is diurnal.

• A. Active at night; example: bats.
• B. Active during twilight; example: deer.
• C. Active during daylight hours; example: many primates or humans.
• D. Lives and forages alone.

Answer: (C)

Diurnal describes animals that are active during daylight hours and rest at night. This pattern fits the example of many primates or humans, who typically move, forage, and interact during the day. The other descriptions reference different timing: being active at night is nocturnal (bats are a classic example), being active at twilight is crepuscular (deer often show this pattern), and foraging alone doesn’t define when an animal is active. So the correct idea is daylight activity, with many primates or humans as typical diurnal mammals.