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 Case of the Wood Tree Frog. Cold blooded animals can do some unusual things as a result of their physiology. For example, in winter, a wood tree frog will bury itself under dirt or leaves and freeze virtually solid with the soil. Its heart and brain functions cease, and the eyes of the frog turn milky white.