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Author Topic: How do bats, in swarms separate individual echoes?  (Read 1681 times)

Offline thedoc

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Pekka Oilinki  asked the Naked Scientists:
   
How do bats, in swarms separate individual echoes?
What do you think?
« Last Edit: 27/07/2015 12:50:01 by _system »


 

Offline Colin2B

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Re: How do bats, in swarms separate individual echoes?
« Reply #1 on: 27/07/2015 18:06:38 »
Pekka Oilinki  asked the Naked Scientists:
   
How do bats, in swarms separate individual echoes?
What do you think?
Bats in the same social group are known to be able to recognise individuals by their calls.
Studies have also shown that bats of the same specie flying closer than 1m use silence of 0.2s to avoid jamming each other's echolocation. They don't tend to do this with bats of different species which use different echolocation signatures.
Interestingly, bats will sometimes jam another bat's echo in order to get the prey first.
 

Offline Pecos_Bill

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Re: How do bats, in swarms separate individual echoes?
« Reply #2 on: 27/07/2015 21:20:07 »
Bats only swarm to confuse predators waiting outside the cave.

They spread out to hunt bugs. The bugs don't school like herring, do they? So it isn't like trying to hear yourself in a noisy crowd.
 

Offline Colin2B

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Re: How do bats, in swarms separate individual echoes?
« Reply #3 on: 28/07/2015 00:18:52 »
Bats only swarm to confuse predators waiting outside the cave.

They spread out to hunt bugs. The bugs don't school like herring, do they? So it isn't like trying to hear yourself in a noisy crowd.
Although bats don't swarm except at pinch points like nest entrance, thier prey can congregate in certain areas. We have Daubenton's bats near us which hunt over water - which attracts large swarms of insects. You can often see 5 or 6 bats working a small area, weaving around to avoid each other. We also get swarms of gnats over our garden in the summer evenings and there are often 2 or 3 bats working the area. Although they are welcome visitors we have to keep the windows closed on the garden side as they sometimes fly in to a room.
 

Offline Pecos_Bill

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Re: How do bats, in swarms separate individual echoes?
« Reply #4 on: 28/07/2015 03:41:32 »
« Last Edit: 28/07/2015 03:43:55 by Pecos_Bill »
 

Offline evan_au

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Re: How do bats, in swarms separate individual echoes?
« Reply #5 on: 28/07/2015 11:56:50 »
Bats that are further away have their chirps attenuated by distance.

As a bat approaches a target, it chirps more rapidly, so that it can home in on the target.
 

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Re: How do bats, in swarms separate individual echoes?
« Reply #5 on: 28/07/2015 11:56:50 »

 

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