If you want the largest sound made by an animal that animal is the Blue Whale.
monkeys
elephant
The sperm whale.
Well your voice is the loudest thing you can use, and "ooo"s and "ahh"s are two of the easiest sounds you can get really loud by yelling.
Well It's how you hear it. To me I would it is the elephant but if you are right next to a lion it may be loud.
Dynamic Range
They produce sounds by their engines
the loudest would be the flowmaster outlaw series. its just a straight through muffler with no ceramic glass packing. i have one on my f-150 it sounds way good
Loud speakers can produce ultrasonic waves. But since the normal purpose of loud speakers is to produce sounds for people to hear, there is seldom a reason to produce sounds that people can't hear (other than to annoy certain animals).
The first is loudest during rest in a healthy person. http://img.medscape.com/pi/emed/ckb/clinical_procedures/79926-79933-1894036-2077859.mp3
Animals do make sounds but it's not all of the animals that make sounds.
No. It does not even make the list of the five loudest birds in the world. The loudest birds are "oil birds", which live in caves and navigate via echolocation. The sounds they make can range up to 100 decibels and this sound is exaggerated because they nest in the thousands. The next loudest birds a re all species of parrots. See the related link below for information on which species of parrots are the loudest.