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The snow leopard is not extinct, it is on the list of endangered species, but not extinct.
Nobody really knows how dinosaurs got extinct.
Overfishing
An ant came and smashed all of the eoraptors
Because of the ice age melting it caused the wolly mammiths to become extinct and many other animals.
Through loss of habitat caused by global warming.
The sea mink became extinct because is was hunted to extinction for it's fur.
Mostly humans polluting lakes and taking there eggs
they can be destroyed by natrul fires or pollution caused by man or the animals become extinct and then they have no habitat because their dead
Plate tectonics cause earthquake which may result into upheavals of earth perishing the living objects that become extinct in due course of time.
Catastrophism.
They are inquisitive and protective of each other which makes them easy prey for whalers.