What caused these yells?

Question

me and a group of friends were camping, the person talking is one of my friends, can someone classify the yells?

is it bigfoot or an injured wolf, we also found tracks but we believe it was a bear.

http://www.youtube.com/watch?v=B2TnbQBTDXY

Answer 1

vocal cords

Answer 2

thats weird i think it was a hurt bear though cuz of the foot prints and the fact it kinda sounds like one when i saw a bear it kinda did sound like that but not as much that is why i think its a bear hurt

hope i helped