There is fundamental difference between human and animal mind, due to which humans possess ‘knowledge’ whereas animals do not. Actually ‘knowledge’ is the ‘theoretical awareness’ of any thing or phenomenon. Only humans are theoretically aware about their surrounding environment as well as about their ownselves, so only humans possess ‘knowledge’. I have discussed this issue in brief, and in quite general way, in my essay on topic: The Knowledge Explosion in the Modern Times.

Instead of considering ‘human knowledge’ just as some kind of advancement in so called ‘animal intelligence’, which some modern philosophers do, if knowledge were defined as “theoretical awareness of any thing or phenomenon” then other animals, at once, would be ousted from the domain of knowledge. And if only humans possess knowledge and animals possess no knowledge at all, then surely there must be a fundamental difference between human and animal mind, which is responsible for the fact that only humans possess knowledge whereas other animals do not.

for more details please see the link
http://khuram.wordpress.com/2006/12/29/some-differences-of-human-animal-...