Cave Catterpillo
Where to find
Also listed for
Maps whose monster list names it without a placed spawn.
Forgotten TunnelFluffkin GrottoAncient Tower
Monster book
The game keeps its monster book text in Japanese only. The text table exists in nine language copies, one per release language, and all nine hold the same Japanese entries, so the game files contain no official English text for the book. This site doesn't write its own translation of game text, so the entry is shown in Japanese as the game has it.
Press the Japanese text button to read it.