Protosiren fraasi Scale:1:35 Its bite—possibly among the most

Its bite—possibly among the most powerful of all known marine vertebrates—would have exerted pressure capable of easily crushing skulls and ribs

es un dinosaurio terópodo celofísido que habitó Norteamérica a finales del período Triásico

which represents a crucial phase in the evolution of cetaceans from their terrestrial ancestors towards forms more adapted to the aquatic environment

The Anzu was discovered in the Hell Creek Formation in South Dakota in 1990

Protosiren fraasi Scale:1:35 Its bite—possibly among the mostProtosiren fraasi was one of the earliest marine mammals in the sirenian group, ancestors of modern manatees and dugongs. It lived during the Middle Eocene , approximately 40 million years ago, and its fossils have been found in regions of North Africa and the Middle East, including Egypt and Pakistan. This genus represents a key intermediate stage in sirenian evolution, when these animals were transitioning from a semi aquatic to a fully marine life.