A new study theorizes that evolution ticks at different speeds, especially when a big group of organisms first appears.

A newly evolved, aggressive “Hulk” wall lizard is spreading out from the Rome region — and researchers are watching a million-year stable system unravel in real time. From three morphs to one: Across ...

The male species is remarkably more colourful than the female in most species, as has been an endless source of wonder for ...

In the animal kingdom, mating isn’t always about survival. From praying mantises to octopuses, some species die during or ...

The origins of consciousness date back about 540 million years ago, when animal bodies became more complex. Feelings like ...

Males engage in a two-week-long sex marathon with as many females as they can find. Each frenzied encounter can last up to 14 ...

Understanding the evolution of insect mating behavior is essential for explaining how early insects adapted to life on land.

The sharp, elongated bills of green hermit hummingbirds aren’t just fine-tuned for feeding; they also allow males to joust like knights over mates The iridescent green hermit hummingbird is known for ...

Scientists say the video offers a unique look into shark mating behavior—and might also help with conservation efforts. Two Indo-Pacific Leopard sharks males observed mating with a female at a reef ...

Scientists found new gecko species hidden in plain sight in pristine deserts of southern Africa, thanks to their loud, barking mating calls On a cool, starry night six years ago, a young scientist ...