• 3 months ago
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Archerfish are notorious for their impeccable aim, but to learn the skill of the kill, they have to go to sniper school.

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This clip comes from Season 1, Episode 1: "Seal Snouts and Sharpshooters"

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Transcript
00:00Lurking in the brackish mangroves of Asia and Australia, these sharpshooters are able
00:08to snipe at unsuspecting insects perched in the trees above by spitting jets of water
00:17from their mouths.
00:19Miss and they go hungry.
00:22But archerfish are incredibly accurate.
00:26And once in the wet stuff, their tasty targets are lunch.
00:37This fantastic shooting skill that archerfish have got gives them access to prey that most
00:43other fish can't get to.
00:45It's very, very handy, but it does come with a little bit of a handicap.
00:51When light enters or exits water, it bends.
00:56It's called refraction.
00:59And it makes items observed from underwater appear to be in a different place.
01:06This trick of the light ultimately affects how archerfish aim.
01:11Because from underwater, when the perceived angle of the prey is at 45 degrees, the true
01:18location of the target can be off by as much as 25 degrees.
01:25So when the archerfish is staring up through the water at its meal, it's not actually in
01:30the place that the fish is looking.
01:33It's ever so slightly off.
01:37But these fishy physicists somehow know this and correct their aim accordingly.
01:48Now you might think that for an animal that makes its living by spitting at insects above
01:52the waterline, it would immediately know that physics is playing a cruel joke on it.
01:57But they don't.
02:00Yep, archerfish all have to learn to become expert marksmen at sniper school.
02:08Young archerfish gather together in giant shoals where they go on massive target practice
02:14events as they learn to make the correction for this little trick of the light.

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