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.
Nocturnal (most active at night) and arboreal (tree dwelling). These frogs live in groups and will get along fine as long as there is proper space for each frog. A minimum of 4 gallons of tank space per frog is a good measure, but the tank should not be smaller than 10 gallons overall, even for one frog.arking tree frogs are generally olive green, brown, yellowish or gray in color with dark, round spots on the back. They have prominent toe pads for gripping, which are typical of tree frogs. The barking tree frog is the largest of the native US tree frogs and has a loud nighttime communication call.