It really is a zoo (and the whole of Western Washington is generally). If you're interested in the topic, I really enjoyed https://www.amazon.com/Roadside-Geology-Washington-Marli-Mil...

Love the geologic zoo!

I refer to botanical gardens as 'botanical zoos' as well

I believe zoo is short for "zoological garden," but of course it's taken on additional meanings. Still, one occasionally hears the term "zoological and botanical garden."