Giant Sloths and also animals that went extinct during the period of humanity and cave men 

Giant sloths were a species that lived in the Americas. also known as Megalonychid, or Ground sloths, 

They were the largest ever of this species. They were about 2 metres high, and were the size of elephants. But they were pushed to extinction by the end of the Ice Age, around 10,000 years ago, and probabaly by hunting by incoming populations of humans. Perhaps with arrows, like clovis flint and such stones types. 

This a painful demise, after lasting for around 35million years.

Some like to belive there are still some in caves, in the Amazon. Indeed there was a British TV programme about it but it did not find anything. They stood upto 10 feet high, and weighed 3 tons.They could stand 20 feet high if standing on all their back 2 feet to reach tops of trees. At a time when horses were tiny, and camels, and such lived in North America. 

They lived from Iowa, into South America. 

A case of a find was another discovery by Thomas Jefferson. 

They were all herbivores.

Megalonyx jeffersonii

Their main surviving relatives today are three toed sloths, as Pygmy Three-toed Sloth (Bradypus pygmaeus) 
Maned Three-toed Sloth (Bradypus torquatus), Pale-throated Three-toed Sloth (Bradypus tridactylus) and Brown-throated Three-toed Sloth (Bradypus variegatus) 
Family Megalonychidae 
and two toed sloths, Linnaeus's Two-toed Sloth (Choloepus didactylus) and Hoffmann's Two-toed Sloth (Choloepus hoffmanni) 

These creatures are about big enough to be cradled by a average height human, so much samllr, but still remarkable little creatures. Indeed it is funny seeing them walk super slowly along the floor, they are so slow. Famously these creatures sleep for most of the day, as of the way they live in trees. 

http://www.smithsonianmagazine.com/issues/2003/may/cuba.php?page=4 The final proof they were, that the last were in Cuba and the rest of the Carribean in 5000BC. People have sadly wiped out species of animals, in Europe the Americas and the whole world, but some still survive and now many people often Native communities or others

Other species pushed to extinction by humans, or in our era include.

Added to giant sloths

Giant lemurs as large as gorillas. 

camels in N America, 

giant commodo dragons in Indonesia and Australia that were 25 feet long. 

3 feet tall people. the Homo Florensis people, but maybe they were wiped out before by a volcano. 

Neanderthals, though they have been absorbed into modern human populations,  

Homo erectus, ditto 

giant armadillos the size of cars in the americas, used as shelters after they were killed,

Also a marsupial lion of 50,000 years agom, with a snake like mouth, and huge jaw, as big as a lion, that looked like a lion and hyena, in australia, 

also mastadons, 

and wild horse in the americas, hyeanas in Europe. 

Sabre tooth tigers.

Wooly mammoths. 

mini wooly mammoths, 

Mini elephants. 

lions in Europe. 

bears in Britain. 

and giant 3 metres tall bears when standing and it weighing 16 people. and being 1.5 metres high on all 4s. 

13 feet tall moas in NZ, 

dodos, which were tame tsasty birds dying out in the 17thC 

North Atlantic style penguins, 

dire wolfs, that were 36% bigger than modern wolves, but not taller, on average

And Madagascan elephant birds weghing 6 people., 

and the NZ eagles 3 metres in wingspan that hunted the 13 feet tall, moas that weighed a couple to a few people. 

and the Gigantopithecus blacki, a 3 metre high gorilla that lived in Southern China, to 100,000 years ago

3 metre high orangutans in south east asia, to 100,000 years ago from 2million too 200,000 years ago. here is a link to a type,

and also American lions

50 feet long Monitor lizards. were alive 10,000 years ago, 

Also giant rhinos, with long horse legs, from Siberia, till 0.8million, well long before these others. some with 6 foot horns,

also wooly rhinos, in siberia dying out 8000bc, some are in legends of Siberia, well it is possible those legends are about these, 

and wild horses and wild cattle in Europe, 

bigger cattle than we have now, except in N-India, the aurochs, 

also 25cm long rats, 

a New Zealand owl that laughed in the 19thC, 

Tasmanian Tiger. 

Also hyenas in North Americas that ran fast like cheetahs

A wombat like hippo sized 2 metre high 3 metres long animals lived in australia to 50,000 years ago.

All of humanity around the world have wiped out animals, but modern man, is the most killing.

Modern Environmentalists are the least killing,

Also in Hawaii were some small birds with curling beaks. 

3 METRE Australian giant geese which went extinct 30,000 years ago, 

stellar's sea cow, A huge sea culture killed by hunting, 

the cave lion of 30,000 years ago, in Europe, 

bigger than lions, and of course quaggas, 

big ducks in Hawaii and geese, but I do not think they were huge,

A comoranmt with ear style looking things in mid 19thC Russia

The Yangtze dolphin went extinct at the start of the 21st Century

A pink headed duck in India and Mynmar in 1935, but it may still exist unlike the othetrs 

Hawain long beaked birds, 

Giant hutias, rodents that weighed 50 KG too 200KG may have continued into the Carribean islands to historic times, but evidence is unsure, they were hunted, They would have not been that different to modern Capybara.

These things would be worth millions in entertainment value, so money should be spent keeping the present animals.

We should spend loads on this, it is worth loads, a natural wonder, joy for all