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.
Amphibian. During the day, red-eyed tree frogs mostly sleep, keeping their eyes closed to help camouflage themselves. If disturbed, a frog will abruptly reveal his red eyes, startling potential predators.This often gives the frog just enough time to jump away to safety.ed-eyed tree frogs have very strong suction cup toe pads that make them agile climbers. Adult males are only about 5 cm (2 inches) in length while the females tend to be larger at 7.5 cm (3 inches). Males croak and quiver, like a song and a dance, to try to attract females.