The amount of sperm released decreased sharply with each mating during a single day, reducing the males' fertilization rate.

If you've ever had a spiny leaf insect as a pet, or you're considering getting one, hopefully someone has warned you about ...

Dungeons & Dragons' upcoming Monster Manual will include artwork showing certain monsters like hags and medusas as having multiple genders.

From a traditional Christian point of view there are still two basic reasons why it is problematic to accept someone as a ...

Among five of a bird's senses, sight is arguably the most important. With around 10,000 individual bird species in the world, ...

For any animal, releasing sperm cells requires a bit of time and energy. Using up so much energy can keep them from the other ...

The nominees for the 31st annual Screen Actors Guild Awards will be revealed on Wednesday morning. Actors Joey King and ...