Otters sometimes lie in the shadows between rocks. When they see the fish swimming, they will quietly immerse themselves in the water, approach from below the fish and bite its abdomen. If you catch a small fish, eat it on the spot; If you catch a big fish, you will catch it on the rocky shore first and then eat it with your forelimbs. Otters generally don't eat fish heads.
Otters live in caves, but generally there are no fixed caves. The nest is selected in the crack of the dike or under the root of the tree to dig the old nest of foxes, badgers and rabbits or to repair it. There are generally two caves, and the entrance and exit holes are generally below the water surface, with a diameter of about 50cm. Another hole extends out of the ground, which is an air hole to facilitate air circulation. The depth of the tunnel varies from a few meters to 20-30 meters. The main caves are wide and usually covered with some hay branches. If the river floods the cave after the rain, it will migrate to the dense bushes on the ground.
Appearance characteristics of otters
The otter has a body length of about 560-800mm, a tail length of about 300-400 mm, an oblate body length, a slightly flat head width, a short kiss, slightly protruding and round eyes, small ears, a round outer edge and a low landing position. There are several short bristles in the center of the chin, several short bristles behind the wrist pad of the forelimb, and small circles in the nostrils and ear canal.
The otter's body hair is long and dense, and its back is brown and shiny. Abdominal hair is grayish brown, villi base is grayish white, and suede is brown.
There are three pairs of otter incisors in a row, and the outermost pair is larger, about twice as large as the other two. The canine teeth are conical and the upper canine teeth are longer than the lower canine teeth. The first premolar is very small and located inside the canine teeth. The upper split tooth is very big, the outer edge is knife-shaped and the inner leaf is large and wide. The upper molar is rectangular and the second lower molar is round.