Top 10. Most Terrifying Wild Animal Sounds\rbr\rbrHippopotamus\rbr\rbrThe common hippopotamus, or hippo, is a large, mostly herbivorous mammal in sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus. Wikipedia \rbrScientific name: Hippopotamus amphibius\rbrSpeed: 30 kmh (On Land, Running)\rbrTrophic level: Omnivorous\rbrLifespan: 40 – 50 years\rbrConservation status: Vulnerable (Population decreasing)\rbrMass: Male: 1,500 – 1,800 kg (Adult), Female: 1,300 – 1,500 kg (Adult)\rbr\rbrHyena\rbr\rbrHyenas or hyaenas are the animals of the family Hyaenidae haɪˈɛnᵻdiː of the feliform suborder of the Carnivora. Wikipedia \rbrScientific name: Hyaenidae\rbrHigher classification: Feliformia\rbrSpeed: Spotted hyena: 60 kmh\rbrMass: Spotted hyena: 44 – 64 kg, Striped hyena: 22 – 55 kg, Brown hyena: 40 – 44 kg\rbrHeight: Spotted hyena: 70 – 92 cm, Striped hyena: 60 – 80 cm, Brown hyena: 70 – 80 cm\rbrLifespan: Spotted hyena: 12 years, Striped hyena: 12 years\rbr\rbrRattlesnake\rbrSnake\rbrRattlesnakes are a group of venomous snakes of the genera Crotalus and Sistrurus of the subfamily Crotalinae.\rbr\rbrElephant\rbr\rbrElephants are large mammals of the family Elephantidae and the order Proboscidea. Two species are traditionally recognised, the African elephant and the Asian elephant, although some evidence suggests . Wikipedia \rbrLength: Asian elephant: 5.5 – 6.5 m\rbrMass: Asian elephant: 2,700 kg, African bush elephant: 5,500 kg, African forest elephant: 2,700 kg\rbrGestation period: Asian elephant: 18 – 22 months, African bush elephant: 22 months\rbrLifespan: Asian elephant: 48 years, African bush elephant: 60 – 70 years, African forest elephant: 60 – 70 years\rbrHeight: Asian elephant: 2.7 m, African bush elephant: 3.3 m\rbr\rbrGorilla\rbrPrimate\rbrGorillas are ground-dwelling, predominantly herbivorous apes that inhabit the forests of central Africa. The eponymous genus Gorilla is divided into two species: the eastern gorillas and the western gorillas, and either four or five subspecies. Wikipedia \rbrScientific name: Gorilla\rbrLifespan: 35 – 40 years\rbrMass: Western gorilla: 60 – 80 kg\rbrHigher classification: Great apes\rbrHeight: Western gorilla: 1.6 – 1.7 m\rbrGestation period: 259 days\rbr\rbrBrown bear\rbr\rbrThe brown bear is a large bear distributed across much of northern Eurasia and North America and is the largest terrestrial carnivoran. There are several recognized subspecies within the brown bear species. Wikipedia \rbrScientific name: Ursus arctos\rbrMass: 100 – 640 kg (Adult)\rbrHeight: 70 – 150 cm (Adult, At Shoulder)\rbrConservation status: Least Concern (Population stable)\rbrTrophic level: Omnivorous\rbrLifespan: Grizzly bear: 20 – 25 years, Marsican brown bear: 35 years\rbr\rbrGray wolf\rbr\rbrThe gray wolf or grey wolf, also known as the timber wolf or western wolf, is a canid native to the wilderness and remote areas of North America and Eurasia. Wikipedia \rbrScientific name: Canis lupus\rbrHeight: 80 – 85 cm (Adult, At Shoulder)\rbrHigher classification: Canis\rbrConservation status: Least Concern (Population stable)\rbrTrophic level: Carnivorous\rbrMass: Male: 30 – 80 kg (Adult), Female: 23 – 55 kg (Adult)\rbr\rbrTiger\rbr\rbrThe tiger is the largest cat species, reaching a total body length of up to 3.38 m over curves and exceptionally weighing up to 388.7 kg in the wild. Wikipedia \rbrScientific name: Panthera tigris\rbrHigher classification: Roaring cats\rbrConservation status: Endangered (Population decreasing)\rbrLifespan: 20 – 26 years (In captivity)\rbrSpeed: 49 – 65 kmh (Adult, In Short Bursts)\rbrMass: Male: 90 – 310 kg (Adult), Female: 65 – 170 kg (Adult)\rbr\rbrLion\rbr\rbrThe lion is one of the five big cats in the genus Panthera and a member of the family Felidae. The commonly used term African lion collectively denotes the several subspecies found in Africa. Wikipedia \rbrScientific name: Panthera leo\rbrLifespan: 10 – 14 years (Adult, In the wild)\rbrConservation status: Vulnerable (Population decreasing)\rbrHigher classification: Roaring cats\rbrTrophic level: Carnivorous\rbrMass: Male: 190 kg (Adult), Female: 130 kg (Adult)\rbr\rbrHowler monkey\rbrPrimate\rbrHowler monkeys are among the largest of the New World monkeys and one of only a few nest-building monkeys. Fifteen species are currently recognised. Previously classified in the family Cebidae, they are now placed in the family Atelidae.