When did woodland caribou become endangered?

It's not accurate to say that woodland caribou as a species became endangered at a specific point in time.

Here's why:

* Different populations: Woodland caribou are not a single, uniform population. They exist in various herds across their range in North America.

* Varying status: The status of different woodland caribou herds varies. Some are listed as threatened or endangered, while others are considered stable or even increasing.

* Gradual decline: The decline of many woodland caribou herds has been a gradual process over decades, driven by various factors like habitat loss, climate change, and predation.

To be more specific, you can ask:

* When did *specific herds* of woodland caribou become listed as endangered or threatened?

* When did the overall population of woodland caribou start experiencing significant decline?

Providing information about the specific herd or geographic area you're interested in will allow for a more accurate and helpful response.