U.S. News has named a member of the Ivy League as the best national university in each of the past fifteen years ending with the 2015 rankings: Princeton eight times, Harvard twice and the two schools tied for first five times.
Frogs tend to be nocturnal because night is the best time for them to catch prey such as insects and worms. Nocturnal terrestrial frogs are often brown or gray with spotted backs, while nocturnal tree frogs are usually green. These camouflage colors keep them hidden from predators as they sleep during the day.
The word nocturnal means that an animal is active (foraging, hunting) primarily at night. Examples are owls, bats, and some mammals that avoid daytime predators. The term â¦ diurnal means that an animal is active during the daytime, and normally sleeps at night.oalas are nocturnal means that koalas are active at night, and  sleep during the day. The opposite of nocturnal is diurnal, meaning  active during the day. 2 people found this useful. Edit.