1) Specimens in jars.
2) Card catalogs.
3) Whales, my favorite animals.
And hey, if you also love my very favorite kind of whale, the orca, and you want to simultaneously completely ruin your day and be fascinated by the intelligence and complex social structures of a marine mammal, then you should watch the horrifying and totally fantastic documentary Blackfish. Warning: I had crazy nightmares for days after watching this movie.