All insects with an aquatic nymphal or larval stage seem to have adapted to water secondarily from terrestrial ancestors.

This too indicates that insects are descended from a terrestrial ancestor.

No matter how accustomed one became to low gravity, the ingrained responses of a million terrestrial ancestors died hard.

Mesosaurs were the first aquatic reptiles, having apparently returned to an aquatic lifestyle from more terrestrial ancestors.

Memories of our terrestrial ancestors and memories of our cosmic teachers are both at work in us.

Its poor sense of smell is expected in an animal descended from terrestrial ancestors that specializes in catching aquatic prey.

However, now plesiosaurs are recognized as highly derived marine reptiles descended from terrestrial ancestors.

Because of this, sirens most likely have evolved from a terrestrial ancestor that still had an aquatic larval stage.

The wolf comparison is about as opposite as I can imagine the whale's terrestrial ancestors to be: small deer-like creatures.

One theory of the origins of human bipedality is that it evolved from a terrestrial knuckle-walking ancestor.