Perils are great dangers.An older, less commonly used word for danger. Example. "Losing its engines in the middle of a storm, put the ship in real peril."
The extinction of a species of animal or plant is the death of all its remaining living members. Example: An operation is beginning to try to save a species of crocodile from extinction. or If someone refers to the extinction of a way of life or type of activity, they mean that the way of life or activity stops existing. Example: The loggers say their jobs are faced with extinction because of declining timber sales.