Field notebook
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Field notebook
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Theme trail
This is a live full-text trail through published facts, not a fixed marketing category.
Crocodylus halli was described from museum specimens and decades-old field notes rather than a new discovery in the field. The animals were well known locally; what changed was the recognition that they were not the same species as their northern neighbours.
Devil facial tumour disease is not caused by a virus. The cancer cells themselves pass from animal to animal through biting, making it one of only a handful of transmissible cancers known in nature.
Whales in the Gulf of Mexico were assumed to be a population of Bryde's whale until genetic and skull evidence separated them. Rice's whale was named in 2021, immediately becoming one of the rarest large animals on Earth.
A black ocellus sits on the rear dorsal fin while a dark band masks the real eye. The arrangement is widely read as redirecting a predator's strike away from the head, though the evidence is more mixed than the textbook version suggests.
Snakes have no external ear and hear airborne sound poorly. A cobra rising to a snake charmer's pungi is tracking the moving instrument as a threat and holding a defensive posture, not swaying in time to a tune.
Male euglossine bees scrape fragrance compounds from orchids, rotting wood and fungi, then pack the mixture into hollow chambers in their swollen hind legs. The blend is not food and not for the nest.
Push a live sponge through a fine mesh and it becomes a suspension of individual cells. Left in seawater, those cells find each other, sort themselves by type, and rebuild a working sponge, an experiment first done in 1907.
In crowded ponds, a fraction of tiger salamander larvae develop wider heads and enlarged teeth and begin eating their pondmates. The switch is triggered by conditions rather than fixed at fertilisation, and cannibals avoid eating close relatives.
Genetic work on invasive Atlantic lionfish points to a very small number of founding individuals, probably released or escaped aquarium stock off Florida. From that bottleneck they now occupy reefs from North Carolina to Brazil.
The tall casque on a veiled chameleon's head is not only a display structure. Condensing dew and mist run down its channelled surface toward the mouth, giving an animal from arid Yemeni highlands a way to drink without standing water.
Female superb fairywrens call repeatedly to their eggs during incubation. Chicks hatch producing a begging call that contains a distinctive element from that call, and parents feed nestlings that reproduce it.
The gelatinous mass sometimes found on submerged branches is not an egg sac, a fungus or a single organism. It is a bryozoan colony: thousands of millimetre-long individuals sharing a secreted jelly matrix.
The best-supported explanation for zebra stripes is not camouflage or predator confusion. Field experiments show that horseflies approach striped surfaces as readily as plain ones but fail to land properly on them.
Trained sheep distinguish and remember the faces of other sheep and of humans, retaining the associations for years. In one study they identified photographs of celebrities they had learned, and still picked out familiar faces shown at an angle.
Emperor tamarins routinely form stable mixed troops with saddleback tamarins, travelling, foraging and responding to alarms together for months at a time. The two species feed at different heights, which reduces competition while doubling the number of eyes watching for predators.
A cowbird is raised by warblers or vireos and never sees a parent of its own kind, yet as an adult it recognises and joins cowbirds. Experiments point to a password call that switches on attention to its own species.
Polistes dominula foundresses carry variable black markings on the face and clypeus. Experiments in which the patterns were painted over changed how rivals treated them, indicating the marks carry social information rather than being decoration.
Female belted kingfishers carry a rufous band across the belly and flanks that males lack, making them the more colourful sex. Reversed plumage difference of this kind is rare among North American birds and its function is not settled.
The thieving magpie is a folk belief rather than a finding. When shiny and dull objects were placed near food, wild-caught magpies approached the shiny items less often, and often avoided them altogether as unfamiliar.
A peacock mantis shrimp accelerates its club so fast that the water behind it cannot keep up. The resulting cavitation bubble collapses with a flash of light and a second shock wave, so the prey is hit twice from one strike.
Described in 2017, Hoolock tianxing takes its scientific name from Chinese characters meaning heaven's movement. Its describers, who are Star Wars enthusiasts, chose Skywalker hoolock gibbon as the English name, and Mark Hamill publicly endorsed it.