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Old Yesterday, 08:59 AM
 
Location: God's Country
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So many questions; so little time.


Anyway, why is the giant river otter impervious to the bites of piranha which is one of the otter's favorite dishes? Best answer I could get from a web search is "'cause they're so tough."


I mean the arapaima fish is also not bothered by piranha but that's understandable, its scales are like armor, but that ain't the case with the giant river otter.
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Old Yesterday, 05:40 PM
 
Location: Erie, PA
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The giant river otter is not 100% impervious to the piranha's bite but does have several adaptations that make it less likely to end up being bitten seriously.

First, it has fur so thick that water does not even reach its skin and the hair is short so it is kind of difficult for the piranha to sink its teeth into. Another advantage the otter has is that it has excellent vision and when it does catch a piranha to eat, it eats it head first to avoid being bitten. Giant otters also tend to hunt in groups so there is always plenty of eyes watching out for trouble and they are highly maneuverable in the water.

On some level, the piranha might recognize them as a predator and simply try to avoid them.
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Old Yesterday, 09:55 PM
 
Location: God's Country
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Quote:
Originally Posted by Marie Joseph View Post
The giant river otter is not 100% impervious to the piranha's bite but does have several adaptations that make it less likely to end up being bitten seriously.

First, it has fur so thick that water does not even reach its skin and the hair is short so it is kind of difficult for the piranha to sink its teeth into. Another advantage the otter has is that it has excellent vision and when it does catch a piranha to eat, it eats it head first to avoid being bitten. Giant otters also tend to hunt in groups so there is always plenty of eyes watching out for trouble and they are highly maneuverable in the water.

On some level, the piranha might recognize them as a predator and simply try to avoid them.

Appreciate your response but it was my impression that piranha travel in large groups and when the otter wades into their territory, the fish go crazy attacking the invader. In other words, it's not just a matter of an otter coming across a solitary piranha and attacking, with only the one solitary piranha to worry about.
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Old Today, 06:35 AM
 
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Generally, piranha do not attack live healthy animals. They are cautious and prefer animals that give them a sense of being injured or of course already dead. Native Americans regularly go into rivers with piranha and aren't harmed. If a person or animal goes into a river and starts thrashing and appears to be injured, that's when they are likely to become piranha food.
Piranha will swim away from a healthy otter. They know the otter is in their fishing for food and they are on the menu.
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Old Today, 05:32 PM
 
Location: NW Nevada
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Never heard tell of critters being immune to teeth. Venom yes, but not a bite wound itself from a toothy critter. Tough thick fur and a thick layer of fat probably helps.
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