Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is an English horror movie with a bit of jungle adventure in it.
A mad scientist goes to the Amazon where he finds the savages offering a virgin sacrifice to a big hairy tree with lots of arms. Men are playing drums and standing around watching a woman in a trance and a man with a painted face and a feathered headdress dances around with a snake in each hand - a Boa Constrictor in the left hand and a Burmese Python in the right hand - as men lead the woman to the hungry tree. The scientist somehow steals the tree and brings it back to England where he feeds it young women to make it produce a liquid that he can experiment with in his lab to bring the dead back to life.
The snakes we see are both real and alive, as far as I can tell. The boa is a native of the Amazon region, the python is from Asia.