1. Blue Shark
2. Howling monkeys
3. Elephant
When elephants trample feet, the vibrations could be heard up to 20 miles through the soil. For information on elephants also communicate through the foot produced by the vibration. Research in African elephants send a message to identify the warning, to say hello and to announce .. "Let's go ..". This voice-powered 80-90 decibels, louder than most people screaming.
4.Frogs
5. Hyena
If you happen to hear laughter or see the hyenas, we suggest you leave the building. Hyena makes staccato, a series of voice-hee hee-hee, high-pitched or so called "giggle" by zoologists as they were threatened, chased, or attacked. This disturbing laughter could be heard up to eight miles away.
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