I love watching them learn to categorize then narrow down. Four-legged animals are all cows or dogs or whatever, then they start to work out dog and cow as separate beings, then dalmatian vs. poodle, etc. Then they become a bit fussier. I said something to a bright four-year-old yesterday about her pants, and she replied, "Maaary! These are CAPRIS." I said, "And capris are a kind of . . . ."
"[massive sigh of endurance] . . . pants, pants, yes, I know."