9
$\begingroup$

The bat's ability for echolocation is amazing (so are other the abilities of other animals). I was wondering how all of it came to be.

$\endgroup$
2
  • $\begingroup$ This is an interesting question. $\endgroup$
    – Chris
    Sep 29, 2014 at 17:56
  • $\begingroup$ youtube.com/watch?v=Z_E3zxx2l9g < might not take much $\endgroup$
    – Mateo
    Sep 29, 2014 at 20:10

2 Answers 2

10
$\begingroup$

The main reason for bats to "develop" their echolocation system was the avalability of an almost empty niche: Hunting insects at night. Birds are not able to hunt without light and here is where the bats come in. They are able to hunt at night and also to live and orientate in environments where they are protected over the day: Caves. Bats at night are also protected from predatory birds.

There is are a few interesting sources if you want to dive deeper into the stuff:

$\endgroup$
7
  • 2
    $\begingroup$ Not a major issue, but owls and nightjars might disagree with your assessment of birds' ability to hunt insects at night. $\endgroup$ Sep 29, 2014 at 19:09
  • 2
    $\begingroup$ They still need some light - bats can hunt in total darkness. $\endgroup$
    – Chris
    Sep 29, 2014 at 19:19
  • 2
    $\begingroup$ They developed this ability because there was an empty niche? So what, they hired an MBA to find a market opportunity and set an R&D budget? There are lots of "niches" in the animal kingdom - your answer doesn't explain how they are evolutionarily determined and filled $\endgroup$ Sep 30, 2014 at 7:37
  • 4
    $\begingroup$ This happens in the usual way: Mutations occur and don't have a negative effect. At some point they prove advantageous, which put selective pressure on mutations which lead to a better adaptation of this new niche. So for example (speculative here) bats were able to navigate better because of mutations in their hearing. This led to a shift of their hunting habits more to the evening, which resulted in the survival of more bats better adapted to this (because less got caught by predators, more food was available etc.). This led to a further selection of animals adapted to this kind of living. $\endgroup$
    – Chris
    Sep 30, 2014 at 7:43
  • 6
    $\begingroup$ Why isn't randomness a sufficient answer for you? Mutations occur randomly, some of the proof advantageous, some are neutral, some negative. $\endgroup$
    – Chris
    Sep 30, 2014 at 8:41
5
$\begingroup$

Remember, evolution says things don't initially develop "for a reason" -- they develop at random, non-harmful mutations are kept in the gene pool, and eventually a selection event occurs (opportunity to exploit another food source or avoid a hazard) which selects for the mutation in some subset of the population. Over the kind of timescales evolution works on, that's enough to take something that is harmless, turn it into something that is just barely useful (though not necessarily for what it's now used for, eg feathers), and then continue to randomly vary it so it works better or differently or whatever.

Echolocation by itself isn't so remarkable -- we generally can tell about what size room we're in by listening to the echos around us. It's focused echolocation that was a breakthrough.

Late addition: In fact, it is possible for humans to learn to echolocate well enough to get an accurate picture of their surroundings. Some blind individuals have demonstrated this under MRI imaging of their brains. It's not common, but this may be because not enough respect has been given to the technique -- just as ASL was not respected until deaf linguists were able to explain why it was so much better than the alternatives.

So maybe what's special about bats is not the ability, but their reliance upon it.

https://en.m.wikipedia.org/wiki/Human_echolocation

$\endgroup$
2
  • $\begingroup$ It would be frat if you provided some references for your response. $\endgroup$ Sep 29, 2014 at 20:52
  • 1
    $\begingroup$ References: The keyword to search for is "punctuated equilibrium". $\endgroup$
    – keshlam
    Sep 29, 2014 at 22:46

Not the answer you're looking for? Browse other questions tagged or ask your own question.