Basic Instinct

I haven't seen this 90's erotic Sharon Stone movie.I think it also has a sequel coming up.Well, this post is actually about animal instinct and has got nothing to do with that Sharon stone flick.Far from it.The title is a misnomer and was brilliantly conceived by the author just to create some initial curiousity among the (sparse and infrequent) readers of this blog.

I was watching Discovery channel the other day.I think the programme was "Wild Discovery" and they were showing a cheetah trying to catch a deer.I find it quite thrilling to see this encounter between the predators and their poor victims.Of how the unsuspecting prey is pounced upon by a hungry and sinister beast.And in turn,how it tries to evade getting devoured and runs for its life.
As I was watching such an encounter,a thought struck me.How do animals in general, differentiate or recognise the different species ? I mean, how does a cheetah know that it should kill a deer if its hungry,at the same time not seeing a leopard as a souce of food.

If we look at our mechanism of separating species,it is primarily through visual perception.When we see a dog, we know it is something that doesn't "appear" like us in its physical form and hence we infer that it belongs to a different species.An important prerequisite to arrive at this kind of an inference is,we should be aware of our physical apperance in the first place.Only then,can our mind compare the image of the dog and image of the human form, before concluding that, right,the dog is indeed different from us.
Now,I have a doubt when it comes to animals.I am not sure if they know, how they look like.Yes,they might have seen themselves in the reflection in the water bodies.But it is quite probable that they are not intelligent enough (i guess, most of them) to 'process', 'store' that image in their memory and map it to themselves.So, when you have absolutely no idea of how you look like,and when some other creature comes and stands in front of you,how can you for sure decide, on whether that creature is of your kind or not ? But animals are doing this with amazing precision.So,I assume they are relying on something more, than just visual perception to identify their friends and enemies.Any theories as to what it could be ? Some food for thought...

PS: Since I was not sure of the name of the movie (for the post's title),did some googling.I ended up seeing some of the posters from the movie and yes,they do look quite "tempting".Maybe I will watch the sequel first.