The earliest evidence of mammals returning to the sea has been found.

The hippopotamus mammal Coryphodon. 
Credit: Anton Wroblewski

A large set of fossilized footprints shows that large prehistoric mammals were gathering in the sea millions of years earlier than we thought.

Anton Wroblewski of the University of Utah and Bonnie Gulas-Wroblewski of the Texas A&M Natural Resources Institute photographed and examined the location of footprints, which Wroblewski first found in 2019, while mapping rocks that formed on an ancient coastline that now is in Wyoming, USA.

Source Article is in Portuguese.

Um grande conjunto de pegadas fossilizadas mostra que grandes mamíferos pré-históricos estavam se reunindo no mar milhões de anos antes do que pensávamos.

Anton Wroblewski, da Universidade de Utah, e Bonnie Gulas-Wroblewski, do Texas A&M Natural Resources Institute, fotografaram e examinaram o local das pegadas, que Wroblewski encontrou pela primeira vez em 2019, enquanto mapeou rochas que se formaram em um antigo litoral que agora está em Wyoming, EUA.

https://vivimetaliun.wordpress.com/2021/06/25/as-evidencias-mais-antigas-de-mamiferos-voltando-para-o-mar-foram-encontradas/