Enter a clue or pattern or both:
The Clue
Duckbill or echidna (9 letter answer)
The Answer
MONOTREME
Tags
Notes
The answer MONOTREME is so rare that it appears less than once every 2500 puzzles.
Related Clues
Egg-laying mammal
Definition
MONOTREME as a noun:
1. (monotreme, egg-laying mammal) = the most primitive mammals comprising the only extant members of the subclass Prototheria