For those who have a mixed-breed dog, it is time to celebrate! This is because National Mutt Day has arrived, a day dedicated to celebrating mixed-breed dogs and highlighting them over their purebred ...

Female mammals often live longer than males, but the reason why has long confused scientists. Researchers who analyzed data from zoo animals found that it is not only genetics, but mating pressures ...

Marine animals like jellyfish, corals and sea anemones often live with algae inside their cells in a symbiotic relationship. The animals give the algae nutrients and a place to live; in return, algae ...