Dangered vs. Endangered

Simple past tense and past participle of danger

To expose to harm or danger; imperil.

To threaten with extinction.

In danger, at risk, said of something where there is a strong possibility something bad will happen to it (for example, a species in danger of going extinct)

Simple past tense and past participle of endanger

Being in a condition or situation where life or serious harm is possible; in danger; at risk.

Small in numbers, with significant possibility of extinction; - of species.

(of flora or fauna) in imminent danger of extinction;