elephant
Howler Monkey's have been known to be very loud, they may be the loudest in a specific zoo that contains Howler Monkey's but I am unsure about the general loudest animal in the zoo.
lion
lion?
Lion
A lion roaring.
The lion is often considered the loudest animal in the zoo. Its roar can be heard up to 5 miles away.
monkey, elephant, giraffe
a chimpanzee who is loud by nature
I think it's a elephant.
elephants? i dont know why does it matter?
The sperm whale.
A zoo is a place for animals and zoo rhymes with 'moo'.