Plesiosaurs evolved from ancestors who lived on land and therefore didn’t have gills and had to surface occasionally for air. It remains unknown how long they could stay underwater. It’s the ...

Although plesiosaurs evolved from land-dwelling animals, time transformed their build for the sea. These reptiles had broad, flat bodies, four powerful flippers and small heads lined with sharp ...

Plesiosaurs evolved from ancestors who lived on land and therefore didn't have gills and had to surface occasionally for air. It remains unknown how long they could stay underwater.It's the latest ...