An otter used its two front paws to tightly press on a Schizothorax prenanti (Ya-fish) more than 20 centimeters and feasted on it. The bitten Ya-fish was still swinging its body, trying to get rid of the otter's attack. In the end, under the tearing of the otter's sharp teeth, the head of the Ya-fish was bitten off, which became a delicious meal for the otter.

This is a precious picture captured by an infrared camera in the Tangjiahe Reserve in Sichuan. This otter is the flagship species of the river ecosystem, the Eurasian otter.

The Eurasian otter inhabits freshwater environments and has a diet mainly of fish. It is the most widely distributed otter species, spanning Asia, Africa, and Europe. They inhabit freshwater environments, including lakes, rivers, streams, and ponds. They also inhabit coastal areas but need to return to freshwater areas regularly to clean them.

Eurasian otters are primarily solitary. Male and female otters can breed throughout the year. They will mate in the water and give birth to 1-4 young per litter. They forage at night and stay in dens during the day, many of which are burrows or tree holes near riverbeds.