What, in your experience, have been the most elusive animals to see at the zoo? I'm referring to animals that the zoo has, but you've either never seen or have never seen being active. Lincoln Park Zoo has two of them; the beavers and the aardvark. I have literally never seen the beavers. There are some wild ducks that also call the beaver exhibit home, but the beavers are always no-shows. And while I've seen the aardvark, I've never seen her active. Every time I go to the zoo, she's asleep. Most of the time she's sleeping in her den but the last time I went she was actually out in the open...but still asleep.