What kind of snake is Kaa? Well according to the Jungle Book, he is an Indian rock python.
Rudyard Kipling depcits Kaa in his "Mowgli" stories. He is considered a mentor to Mowgli and, along with Baloo and Bagheera, he is a companion and friend to the man-cub lost in the jungle.
Although Kaa is calm in temperament and doesn't seem to be a threat to Mowgli, all the other animals treat him with respect.
He shows that he's not to be messed with when he demonstrates his powers of hypnosis.
In the Jungle Book, Kaa looks like this:
I can see the resemblance!