Humanity itself causes endangerment of animal species due to poaching, deforestation and pollution.
Humans are the main reason that puma is endangered species. As a species, the puma is not an endangered species. Only the Florida race is endangered.
The main reason is they don't want species of animals to be annihilated.
Humans.. mostly
Habitat loss threatens the jaguar, but this species is not an endangered species, rather listed as near threatened.
The gray wolf is not an endangered species. Listed as least concern by the IUCN.
To see animal safaris and things like that.
They are being hunted or their environment is being changed.
The main reason for animal cruelty is hunting and to make money. Some people is cruel to animals just for fun.
The main reason is how weak and vulnerable they are just after molting. The new exoskeleton is still soft to allow growth of the animal. The other is the reason they hide DURING molting - it renders them immobile, some species have to lie on their back for hours on end and can't defend themselves.
Mostly because Japanese people have killed them for their meat and blubber.
The buffalo, or bison was the main species hunted by the plains tribes.
Not all penguin species are endangered. Human actions and environmental changes have endangered many penguin species. For example, humans have hunted penguins for oil and polluted their habitats.