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.
ANSWER: Most species of frogs are nocturnal, but many others are diurnal. There are over 4,800 distinct frog species living in a variety of habitats, and each species has adapted a sleep pattern that suits its diet and surroundings.rogs that hunt and breed during the day have developed very different defenses from nocturnal frogs. Many poisonous frogs, such as dart frogs and and mantellas, are diurnal. Instead of camouflaging themselves and hiding, as most nocturnal frogs do, diurnal frogs secrete toxic chemicals that protect them from predators.