Animals have been reproducing sexually for hundreds of millions of years, but not always like we do it. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Bdelloid rotifers are ancient, asexual, oddballs. The teeny-tiny ...

The energy invested in animal reproduction is as much as 10 times greater than previously estimated when the metabolic load of bearing and caring for offspring is accounted for, according to a new ...

Animal reproduction and breeding encompasses the full spectrum of natural, assisted and genetic processes that underpin the perpetuation, improvement and conservation of species across diverse taxa.

Animals possess circadian clocks, or 24 h oscillators, to regulate daily behavior. These typically take their cues from the periodic change of sunlight and darkness. However, many animals are also ...

Animals from completely different branches of the tree of life such as insects, worms and vertebrates independently evolved ...

Nature's oldest creatures defy aging rules. Greenland sharks live nearly 400 years. Ocean quahogs reach over 500 years. Bowhead whales exceed 200 years. Giant tortoises and rockfish also show ...

The menstrual cycle plays an essential role in human reproduction. However, most other animals don't experience menstruation. So, which other species have periods, and what's the evolutionary point of ...

Optical illusions aren't just for humans; animals also experience and utilize them for survival and reproduction. From appearing larger to scaring predators, these visual tricks reveal how animal ...