According to a 2004 paper on the foraging tactics of baikal seals,[10] during the summer nights these seals are known to have different foraging strategies during night time and during day time. During the day, these seals use visual clues to search for their prey, which is mainly fish, while during the night they use tactile clues to hunt crustaceans. Since it's brighter during the day, the seals are able to see much better in order to hunt for the fish.