The term 'crepuscular' describes red pandas' activity at dusk and dawn. This is an evolutionary adaptation used to avoid predators or cool temperatures. It's driven by internal body clocks, also known as circadian rhythms.
Red pandas are crepuscular. This term describes animals that are most active during the twilight hours of dusk and dawn, such as deer, rabbits, and some species of birds. Being crepuscular is an evolutionary adaptation, usually to avoid predators and/or to take advantage of cooler temperatures. It is a behavioural pattern distinct from being diurnal (active during the day) or nocturnal (active during the night). While it may seem like crepuscular animals are simply active at random times, they are actually following a very specific pattern determined by the same internal body clocks that humans have, known as circadian rhythms.
Learn more about Crepuscular animals