4 ms·

I wonder how many years of evolution it took for tunas to target the back end of a shark instead of the front. And how many more years it will take before tuna

• gerdesj 4y ago
  Although the article is riffing on "nosh rubs itself on a food blender", there were not really very many samples of that behaviour seen. 106 rubbings in total, some against a shark and some not - unclear, let's say 50. They mention over 100,000 individuals seen. I'd venture that evolution isn't involved at all and it is simply opportunism that was observed. It's such a rare event that we can't science this one much. Before you grow fingernails, you need to grow fingers. Before you grow fingers, you need something to wave them around on otherwise they don't do much - that'll be arms (or legs). Fish have been there, seen it, done it (multiple times) and reverted too (multiple times).
• heavyset_go 4y ago
  I wonder if its a learned behavior versus something instinctual.
• 2-718-281-828 4y ago
  > I wonder how many years of evolution it took for tunas to target the back end of a shark instead of the front. I would not be surprised if they can think and learn by observation. Then there would be no need for evolution.