Archerfish
A fish that compensates for light refraction, gravity, and distance to hit insects 3 meters above the water with a jet of water
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Superpower
Archerfish spit jets of water with sufficient force to knock insects from overhanging vegetation up to 3 meters above the water surface, while simultaneously compensating for: the refraction of light at the water surface (which distorts where the insect actually appears to be), gravity acting on the water jet in flight, and distance to target. They achieve accuracy exceeding 90% at 1–2 meter ranges. More remarkably, they predict where a falling insect will land in the water before it falls — and position themselves at that spot before the insect arrives.
Overview
Archerfish (family Toxotidae) are found in brackish mangrove estuaries and freshwater streams across the Indo-Pacific. They generate their water jet by pressing the tongue against a groove in the roof of the mouth, creating a water channel, then contracting gill covers to force a high-velocity stream through it. They can adjust the jet's shape to deliver more force at the point of impact. Research has also revealed unexpected cognitive abilities: archerfish recognize individual human faces with high accuracy when trained to do so.
Found in
Brackish mangrove estuaries, coastal freshwater, and streams from India to Australia. Most species require access to both fresh and saltwater during their lifecycle.
Things worth knowing
- 1
Archerfish adjust the speed of the water droplets in their jet so that they all arrive at the target simultaneously — the water coalesces just before impact, delivering maximum force at the point of contact rather than spreading out in flight.
- 2
Young archerfish are poor shots and learn by watching experienced adults — researchers have confirmed that naive fish improve their accuracy significantly after observing successful shots, a form of social learning.
- 3
Archerfish can recognize individual human faces in experiments with 81% accuracy — a cognitive ability previously thought to require a larger brain with a neocortex. Archerfish have neither.
- 4
The refraction compensation archerfish must perform requires calculating the actual position of a target seen through two different media — a problem that requires geometry. They do this without formal knowledge of Snell's Law.
- 5
Archerfish sometimes shoot at prey that hasn't moved yet — anticipating that a resting insect will move into a shootable position, and preparing the shot in advance.