How Hagfish Use Slime as Their Main Defense
A shark closes its jaws around what looks like an easy meal: a soft-bodied, eel-shaped hagfish. Then, almost instantly, the predator’s mouth fills with a strange fibrous slime. The material …
Evolution
This Icefish Lives Without Functional Hemoglobin in Its Blood
Beneath Antarctic sea ice, seawater hovers close to its freezing point. Light filters through cracks in the ice, illuminating a world of sponges, crustaceans, and fishes whose bodies have been …
How Pygmy Marmosets Cling to Vertical Trees With Claw-Like Nails
Introduction The hands of a monkey are usually imagined as grasping tools: flexible fingers tipped with flat nails, wrapping around branches much as a human hand might. Pygmy marmosets complicate …
How Marine Iguanas Remove Excess Salt From Their Bodies
A marine iguana emerging from the Pacific can look as though it has just sneezed a cloud of seawater from its nose. Moments later, pale crystals may begin accumulating around …
How an Echidna’s Snout Detects Tiny Electrical Signals
An echidna moving across an Australian forest floor can look almost methodical. Its head stays low as it noses through leaf litter, investigates rotting wood and presses its long, narrow …
Scorpionfly Courtship: Why Some Males Offer Females a Food Gift Before Mating
At first glance, a scorpionfly looks slightly alarming. Its elongated face, patterned wings, and—in males of many species—a bulbous, upturned genital structure can create the impression of an insect armed …
How Semi-Aquatic Anoles Breathe Underwater Using a Rebreathing Bubble
A small tropical lizard dives beneath the surface of a stream. Instead of immediately swimming back toward air, it settles underwater. Then something unusual appears around its snout: a silvery …
Animal Noses Explained: How Mammals Use Their Noses to Smell, Hunt, and Survive
Introduction An elephant’s trunk, a mole’s pointed snout, the enormous nose of a proboscis monkey, and the moisture-covered muzzle of a deer may look completely different, but each represents an …
Animal Fur Patterns: How Stripes, Spots, and Colors Help Mammals Survive
Introduction A tiger’s bold stripes, a leopard’s intricate rosettes, the snowy camouflage of an Arctic fox, and the striking black-and-white markings of a skunk all tell a story far deeper …
Ears Built for Survival: How Animals Use Extraordinary Hearing to Thrive
Introduction For many animals, survival depends not on strength or speed but on the ability to hear danger before it arrives. Across deserts, forests, grasslands, and savannas, evolution has shaped …