An astrophysicist and an eye expert teamed up to solve the mystery of how and why reindeers’ eyes switch from yellow to blue in wintertime.

Many animals have adapted to living in total darkness. These species differ from nocturnal animals, like cats. These creatures live in total darkness and have adapted to these environmental extremes.

Scuba diving scientists found cryptic sea animals with over 17 arms that only emerge at night and discovered new species: cryptic feather star, study said.

Scuba diving scientists found cryptic sea animals with over 17 arms that only emerge at night and discovered new species: cryptic feather star, study said.

Scuba diving scientists found cryptic sea animals with over 17 arms that only emerge at night and discovered new species: cryptic feather star, study said.

Scuba diving scientists found cryptic sea animals with over 17 arms that only emerge at night and discovered new species: cryptic feather star, study said.

Instead, the feather stars of Palau came out “exclusively” at night — a significant change in behavior that led some scientists to suspect the nocturnal animals were an undescribed species ...

The sensory system of mice is especially useful for nocturnal animals like mice that navigate in lightless burrows and in the dark corners of our houses. Mice can use specialised muscles to move ...