The animal of the day is the Hippopotamus. (Did you know: Hippos are extremely territorial and violent. They kill more humans per year in Africa than rattlesnakes, lions, hyenas and crocodiles combined! They are the 4th largest mammal on the planet [after whales, elephants and rhinos]. Hippos are semi-aquatic, and have a wide range of buoyancy options that let them either float on the top, or sink to the bottom and run along a river or lake bed!
Also, GRE word of the day! Hippos are retromingent!)