Animal / Human descrimination by snakes ...

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This is probably totally random, and I can not put scientific backing to it at all - but I swear Both of my snakes can discriminate between my two cats.

I have had both snakes out on numerous occasions to test the theory.

One of the cats (the larger of the two cat ironically) I could literally put either snake next to (Not that I would- I watch all the animals very closely, but I can get them close) With out any reaction what so ever.

The other cat seems to be the bane of both snakes existence. Both react negitivly, and my milk, will actually strike out at it, if the cat gets close to the enclosure and the snake is out of the substrate.

I am sure that part of it is the smell .. but if that is the case wouldn't they strike out at both cats?

I have a friend that also swore up and down that his snake hated his mother. She was the only person the snake ever really acted up for (as far as showing aggression) The mothers fear response I am sure was part of the aggravation - but I know that other people were fearful around the snake as well and it never got quite as bad as it did with the mother.

Has anyone else picked up odd behaviors like this in any of their animals?