The odd mechanics of living things, by Maren.
Sorted newest first.
The Saharan desert ant runs hundreds of meters across landmark-free terrain in foraging loops, then heads straight home. It is doing dead reckoning at insect scale, with mechanisms that took biologists fifty years to work out.
Spider silk has the strength-to-weight ratio of high-grade steel, the elasticity of nylon, the toughness of Kevlar, and is made at room temperature from water-soluble proteins by an animal smaller than your thumb. The chemistry has been understood for decades; reproducing it in a factory is sti
Every 17 years (or 13, depending on the brood), billions of periodical cicadas emerge from underground across the eastern United States in synchronized choruses that thin predators by sheer numbers and disappear within weeks. The synchronization mechanism is biological clockwork, the prime-numb
The wood frog spends winter as a solid block of ice. Its heart stops, its blood crystallizes, and its body becomes brittle. In spring it thaws and resumes activity within hours. The biochemistry that makes this possible involves glucose at concentrations that would kill a human, antifreeze prot
A small beetle in your garden can mix two chemicals in a reaction chamber that reaches 100C and aim the resulting boiling spray with precision at attackers. The mechanism is one of the most sophisticated examples of biological engineering and was an important data point in 1980s debates about e
A monarch butterfly migrates from Canada to a specific Mexican mountain valley its great-great-grandparents left the previous spring. No individual butterfly experiences the round trip. The route is encoded somewhere, and the mechanism is one of the strangest cases of inherited navigation in bi
After years in the open ocean, salmon return to spawn in the exact stream where they hatched. The mechanism turns out to be a kind of olfactory memory imprinted during a brief juvenile window, with implications for animal cognition that extend well beyond fish.
Elephants produce infrasonic calls below the human hearing range that travel through air for kilometers and through the ground for tens of kilometers. The discovery rewrote our model of how large mammals coordinate across landscapes.
A woodpecker strikes a tree at velocities that would cause severe concussion in a human, 12,000 times a day, for its entire life. The story of how the bird avoids brain injury is more complicated than the schoolroom version of skull cushioning, and the answer involves a structural surprise.
Sharks can detect electric fields as weak as a few billionths of a volt per centimeter — the field generated by a flatfish's heartbeat. The receptors that do this are jelly-filled pores on the shark's snout, and they represent one of the most sensitive sensory systems known in any animal.
Hummingbirds beat their wings 50-80 times per second, hover in still air, fly backward, and survive on a metabolism that should not work. The physics that lets them do it is a unique convergence in vertebrate evolution and one of the few cases where a backbone has solved a problem usually reser
Octopuses have roughly 500 million neurons distributed between a central brain and eight semi-autonomous arms. They solve novel problems, recognize individual humans, and execute tool-using behaviors. The interesting question is not whether they are intelligent but what intelligence looks