Field notebook
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Common Loon
Most flying birds carry air-filled bones to stay light. The common loon does the opposite, packing dense, largely solid bones that trade lift for the ability to dive tens of metres after fish.
Aardwolf
Despite its hyena-family membership, the aardwolf hunts nothing larger than an insect. A single night's foraging can involve tens of thousands of individual harvester termites, gathered with a sticky tongue rather than a bite.
Banded Archerfish
Banded archerfish fire water from their mouths to knock insects off leaves, and the jet accelerates after release so its tip strikes with more force than the mouth that launched it.
Indian Rhinoceros
Hunted down to roughly 200 animals by the early 1900s, the Indian rhinoceros now numbers over 4,000, concentrated almost entirely in a small cluster of protected river-valley parks.
Sunda Pangolin
The Sunda pangolin's tongue can stretch far past its snout to probe insect nests, and its root sits deep in the chest cavity near the pelvis and last ribs rather than attaching to the jaw like most mammal tongues.
White-bellied Pangolin
The white-bellied pangolin's prehensile tail can grow longer than its head and body combined, functioning as a fifth limb that lets it grip branches, hang, and forage for ants high in the forest canopy.
Sarcastic Fringehead
Male sarcastic fringeheads settle disputes over shelters not by biting but by pressing their wide-open mouths together in a shoving match, a contest where mouth size, not body size, often decides who retreats.
Kagu
The kagu, a ground-dwelling New Caledonian bird, has fleshy movable flaps called nasal corns covering each nostril, a structure not documented in any other living bird species and linked to its habit of probing leaf litter.
Loggerhead Shrike
Loggerhead shrikes spear insects, lizards and mice on thorns or barbed wire, using the spike as a substitute for the strong grasping talons they never evolved.
Sea Angel
The sea angel Clione limacina hunts almost nothing but shelled pteropods called sea butterflies, extracting them from their shells with a retractable set of hooked buccal cones rather than a radula alone.
Rainbow Trout
Anglers often treat them as separate fish, but steelhead and rainbow trout share identical DNA. The only difference is a lifestyle choice: whether a young fish swims to the ocean or stays in its home river.
Ground Pangolin
The ground pangolin's tongue does not attach at the throat like most mammals. Instead it runs back to the pelvis, letting the animal unfurl a probe longer than its own body deep into insect nests.
Atlantic Mudskipper
Atlantic mudskippers spend most of their active hours out of water, absorbing oxygen through their skin and mouth lining rather than relying only on gills, a trait called cutaneous respiration.
Fossa
Before reaching sexual maturity, female fossas grow an enlarged, spine-covered pseudo-penis and rust-orange fur matching adult males, a disguise thought to reduce harassment, then lose both traits within a couple of years.
Stingless Bee
Their sting is reduced to a useless stub, so defence falls to mandibles, resin and sheer numbers. Some species bite hard enough to draw blood, and a few smear caustic plant secretions into the wound.
Green Humphead Parrotfish
Humphead parrotfish bite living coral, grind the skeleton in a throat mill of interlocking teeth, and excrete the rock as fine white sand. Estimates for large individuals run to several tonnes per fish per year.
Eurasian Curlew
A curlew probing deep in mud cannot open its whole bill against the sediment. Instead the upper mandible flexes near the tip, a mechanism called rhynchokinesis, so the bird can grip a worm at depth with only the last few millimetres moving.
Hall's New Guinea Crocodile
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.
Sea Squirt
The adult is a filtering sac with no backbone and no obvious head. Its larva, by contrast, swims with a tail stiffened by a notochord and a dorsal nerve cord, the defining features of the group that includes vertebrates.
Compass Termite
The flat faces of the wedge point east and west, so the broad sides catch weak morning and evening sun while the narrow edge meets the fierce midday sun overhead. The alignment is remarkably consistent across a plain.
Yucca Moth
Almost all pollination is accidental, a by-product of insects seeking food. The female yucca moth gathers pollen with specialised mouthparts, lays eggs in the flower's ovary, then climbs the style and packs the pollen in deliberately.
California Sea Hare
Aplysia californica has around twenty thousand central neurons, some nearly a millimetre across and individually identifiable from animal to animal. That combination made it the organism in which the cellular basis of simple learning was first worked out.
Largetooth Sawfish
Newborns move out of estuaries and into fresh water, where they can spend several years before returning to the sea. That nursery habit put the species deep inland, and it is why dams and water extraction hurt a marine ray.
Northern Short-tailed Shrew
Toxic saliva from the short-tailed shrew's submandibular gland can immobilise invertebrates and small vertebrates. The shrew stores paralysed but living prey, keeping a fresh larder through periods when hunting is poor.
