The mammal known for its nocturnal habits is the "bats." Bats are the only mammals capable of sustained flight and primarily engage in activity during the night to hunt insects and forage for food. This nocturnal behavior helps them avoid predators and compete for resources, as many of their food sources are most active during nighttime hours. Additionally, bats utilize echolocation to navigate and find prey in the dark, emitting sounds that bounce off objects and return, allowing them to build a detailed picture of their surroundings. Their ecological role is vital for pest control and pollination.