Missing Links
{{#rendered}} {{/rendered}}The ancient elephant Moeritherium, as imagined by German naturalist painter Heinrich Harder around 1920. (Public domain)
Indohyus, a possible ancestor of whales that swam in shallow water 48 million years ago in what's now India. (Carl Buell)
An artist's imagining of the ancestral turtle Odontochelys semitestacea, which lived in present-day China. (Marlene Donnelly)
A partial skeleton of Odontochelys semitestacea, an ancestral turtle which had a shell covering its stomach but none on its back. (Institute of Vertebrate Palaeontology, Beijing)
Tiktaalik, an intermediate form between fish and amphibians that lived 375 million years ago. (Ted Daeschler)
A life model of Tiktaalik alongside a plaster cast of its fossil. (AP)
A partial skull of Kryostega collinsoni, a temnospondyl or crocodile-like amphibian that lived 240 million years ago. (Christian Sidor)