Because the dataset is pulled from Wikidata: (drop bear) https://www.wikidata.org/wiki/Q4819356

Hahah in a moment of desperation I put “unicorn” which its response made me laugh out loud.

Ahah. After trying myself, I immediately tried "Obama" and it works ! But oddly enough, most personality with a name in the "List of organisms named after famous people" doesn't work. Nether does bacterium or fish !

https://en.wikipedia.org/wiki/List_of_organisms_named_after_...

The flatworm genus Obama is not named after Barack Obama. https://en.wikipedia.org/wiki/Obama_(flatworm)

The Australian Museum recognises them also: https://australian.museum/learn/animals/mammals/drop-bear/

Somewhat more impressively, it recognises bungarra .. although it stalls out and fails on other similar words for various local animals.

“Haggis” also gets a good response