Here it is in context:
When people appeared in Australia, many species died off. This is true of Europe. Think woolly mammoth.
What does it mean and why there is no article before "wolly mammoth"?
Learn English – Meaning of the phrase “think something”
meaning
Best Answer
Interesting question. It is an idiom used by article-writers. I think of it as having implied quotation marks, so it really means
i.e.
But this is not a very convincing argument.
I think you just have to accept this idiom "Think [name of a concept>]".