Synapsida

Tucuxi In this series so far, I have generally been referring to the Delphinidae as the "dolphin family". That's a literal tra...

Megistotherium , a Miocene hyena-cat The majority of the land-based mammalian predators we are familiar with today belong to the order Carni...

Northern bat There is no particular reason why bats should be nocturnal. True, nocturnality has many advantages, but so does daytime activi...

Rough-toothed dolphin To our human eyes, it's easy to distinguish the major habitat types on land. There are pine forests, tropical jung...

The waters off the coast of Alaska are supposed to be cold, especially in winter. Yet, in the autumn of 2013, they cooled far less than they...

Pyrotherium Even at the dawn of the Oligocene, South America had already long been isolated from the northern continents, giving it the oppo...

Commerson's dolphin While related, dolphins and porpoises are regarded as distinct types of animals. Each is placed in its own family, w...