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Animals of the genus Ambulocetus are intermediaries between basal mammals and modern whales, and possibly ancestral to modern whales.
Ambulocetus, is the ancestor of the whales. It was known as the walking whale because it could walk on land, though it spent most time in water.
All modern day organisms have an ancestor in the Jurassic.Identifying which fossil animals are the direct ancestors of any modern day animal is impossible since fossils don't preserve DNA.However comparing the bones of fossil animals and those of modern day animals, family trees can be hypothesised.With modern day animals their DNA can be compared to produce much more accurate results.
The early ancestor closest to modern man in intellectual ability was the
Archaeopteryx is not believed to be an ancestor to any modern animals. However, it was probably closely related to the evolutionary link between birds and dinosaurs.
The aurochs (Bos primigenius) is an extinct species of ox that once lived in Eurasia. It is the ancestor of modern cattle (Bos taurus).
The sackbut
wolves
the grey wolf
Dingos, wolfs,
gray wolves
Marine mammals such as whales, dolphins and porpoises, are collectively labelled cetaceans (of the order Cetacea, comprising 87 modern species). Cetaceans appear to have evolved from a land mammal that began adapting to marine environments 50,000,000 years ago; the earliest known 'proto whale' (ancestor of modern Cetaceans) is named Pakicetus- a land-based quadruped that eventually evolved into Ambulocetus, which lived in shallow waters but were still able to walk on land.