rhamphotheca:

Rodhocetus is one of several extinct whale genera that possess land mammal characteristics, thus demonstrating the evolutionary transition from land to sea. The ear bones of Rodhocetus are already very whale-like, though the swimming style is very different. Rodhocetus is more obviously aquatic than earlier known species (e.g. Ambulocetus) and had large, paddling hind feet to propel it through the water. It also had a strong tail which may have helped to act as a rudder… 
(read more: Wikipedia)         (image: Pavel Riha)

rhamphotheca:

Rodhocetus is one of several extinct whale genera that possess land mammal characteristics, thus demonstrating the evolutionary transition from land to sea. The ear bones of Rodhocetus are already very whale-like, though the swimming style is very different. Rodhocetus is more obviously aquatic than earlier known species (e.g. Ambulocetus) and had large, paddling hind feet to propel it through the water. It also had a strong tail which may have helped to act as a rudder…

(read more: Wikipedia)         (image: Pavel Riha)