Question

why are bats activate during night [ Nocturnality]?​

Answer 1

Answer:

Most probably, he says, bats fly at night to avoid competition with insectivorous birds. Flying consumes so much energy that each female bat is only able to produce a single off-spring a year. ... Speakman expected that Norway's northern bats, Eptesicus nilssonii , would respond when insects are most active.

Answer 2

Answer:

Most probably, he says, bats fly at night to avoid competition with insectivorous birds. Flying consumes so much energy that each female bat is only able to produce a single off-spring a year. ... Speakman expected that Norway's northern bats, Eptesicus nilssonii , would respond when insects are most active.