Sperm whales, the planet’s largest toothed predator, have incredibly complex social structures and cultural practices. During a recent WWF-backed research expedition around Greece’s northwestern ...

To fascinate us, sperm whales do not require vengeful tempers, like that possessed by Herman Melville’s fictional white leviathan, Moby Dick, though some controversial new research suggests they ...

Semen, also known as seminal fluid, is the fluid secreted from the penis during ejaculation. The fluids are populated with spermatozoa (sperm cells) that can fertilize an egg. When viewed under the ...