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I heard about Larger cats eating the cubs. Is it some kind of facultative cannibalism or they can eat there own kind like that?

What are the facultative cannibalism present in animal kingdom?

What is the genetic origin?

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+1 Spawned a related question on Pets Will neutering a male cat stop it from killing kittens? –  James Jenkins Jul 28 at 18:37

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Lions

Lions are a classical example of cannibalism. To understand why this occurs we have to understand their mating system.

Males have harem of females and males fight in order to access a harem (Note: females may also take part in the battle depending of which male they prefer). When a male takes over a new harem, he may kill the youngs of the previous male if these youngs are still dependent on their mother. The reasons are:

  1. The mother is not fertile while she is taking care of a young baby while the male would appreciate that the female is ready to raise his own kids.

  2. The mother need to invest quite a lot of energy to feed/milk their youngs while the new male would prefer this energy to be invested in his own offspring.

In short, a male kills the youngs when he takes over a new harem because these youngs do not carry his genes and prevent this new male to optimally pass on his own genes as the offsprings of the previous male consume time and energy from the females of the harem.

And well…once the offsprings are killed, it would be a shame to waste all this good and fresh meat. Better to eat them!

In the cases of lions, cannibalism does not result from food shortage but from "not wasting food". I think that the "not wasting food" hypothesis is the most explanation for cannibalism (I am not sure though). I guess that most often the "not-wasting food" occurs after death due to competition as it is the case in lions.

Other Examples

There are many cases of cannibalism in the animal kingdom. Chimpanzees eating other chimpanzees and bears eating other bears. In the tiger salamander, there are cannibal morph and normal morphs. In this species cannibalism is very frequent as in nature one offspring over 5 is eaten through cannibalism (if I am not mistaken). Cannibalism is very common in prairie dogs as well (Reference). In Dragonflies cannibalism represents 95% of the total mortality (Reference).

Sibling sharks eat each others in their mum's womb. Here is a video on the subject. This type of cannibalism is called siblicide.

In Praying mantis the female may eat her mate after copulation. This is referred to as sexual cannibalism. The subject is slightly controversial, please have a look to the wiki article for more info.

In many species (including the dragonflies example above) the old individuals eat the youngs. This is referred to size-structured cannibalism.

Fillial cannibalism is a type of cannibalism when the adults eat the own offsprings as it is the case in the prairie dogs example I cited above.

Have a look to the wikipedia links for fillial cannibalism, sexual cannibalism and siblicide, they go further than my answer.

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Wow!! Can you add something about Siblicide too? –  Devashish Das Jul 28 at 14:02
    
I don't know much about all that. I'd suggest you to have a look to the wiki articles I linked in my answer and eventually come up with a more accurate question on another post as this post was fairly broad. –  Remi.b Jul 28 at 14:29
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@Remi.b the video you linked says that the oldest embryo eats the young ones as soon as its teeth are sharp enough. So not that much selection going on, except for the possibility that an older embryo with retarded development could be eaten by a younger sibling with normal development. But there isn't a bunch of embryos hunting each other at once. –  rumtscho Jul 28 at 16:29
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@Remi.b Your comments makes it seem that you believe that a species has conscious control over evolution or that the mother shark has control or influence on this type of behavior of the embryonic sharks within her. This is just NOT how nature works. –  TecBrat Jul 29 at 0:19
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Ha ha seems that I would have better to remain silence on possible explanation of the shark siblicide. I have to confess that it was a quick thought. @TecBrat No, I didn't any of these naïve mistake. I am just saying that the parents may want to make sure that their unique offspring is fit to carry the parents' gene further. –  Remi.b Jul 29 at 2:11

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