Bongard Problems

[TheGreatErenan]

I still don't see anything.

I tried replacing the letters in each word with numbers by going A = 1, B = 2, C = 3, but this didn't produce anything that jumped right out at me. Adding up the numbers in each word didn't yield anything useful (lion, snake, and owl all add up to 50). Both lion and boar have the same pattern of even and odd letters (even, odd, odd, even). Keeping a running total of the differences between letters didn't give me anything interesting (i.e. bat is 2, 1, 20, so -1 + 19 = 18, etc.).