To investigate, the team tracked down 140 Pollimyrus fish specimens in archives and compared the animals’ appearances ... root stocks” along the riverbed. Thousands of new species are found ...

This left them exposed along the riverbed. Giant ground sloths are a ... “It’s essentially the same animal, but through time it got so much bigger and the bones changed enough that researchers ...

In a shallow stream of northern Brazil, a toothless “electric” creature weaved its way through the tangled roots and dead ...

but some mussels use their single foot to move around on the riverbed. Just like us, mussels have a heart, kidneys, a stomach, and a mouth! Like fish, mussels also have gills. The gills of mussels ...