Taxonomy is the grouping of species according to shared traits. For example, mammals are generally warm-blooded, nurse their young, and have hair. Some taxonomic rules have exceptions; if you think mammals don't lay eggs, the platypus would like to have a word with you.

A junior taxonomist, with knowledge of animals confined to what she can glean from her favorite poster (see above), might infer that mammals can mostly be distinguished from non-mammals according to what rule? This rule has no basis in biology, but it correctly classifies 22 of the 26 animals as drawn by the artist.

When I was nine, I loved this joke: "If vegetable oil comes from vegetables, where does baby oil come from?"
Now I'm thirty-seven and sad at the thought of someone squeezing my baby for her precious oil. 😥 But I still love some good old lexical ambiguity!

1. 👶 What do you call it when you erase all the data on your baby?
2. 👶 What do you call equations that plot a baby? (Hmm, neither this nor this is quite right...)
3. 👶 What's another name for a high chair?
4. 👶 What did the caveman say when he discovered his baby was infested?
5. 👶 And what did the caveman say when his baby was all better? (Other cavemen were confused about why he would seemingly reference a musical instrument.)

Congratulations to yesterday's full and partial solvers Yana, Nico, Leo S., and Mr. Gregg. Thanks to everybody who made a guess!