First land animals shuffled like seals

The assumptions implicit in the world's first 3D reconstruction of a four-legged animal backbone suggest that the first animals on land moved like mudskippers or seals. One of the studied animals was the Ichthyostega which lived 374 to 359 million years ago and was a transitional species between fish and terrestrial animals. Ichthyostega is thought to have navigated through shallow water in swamps, probably lured by food.