"Unknown Removable Part" on Rajang appears to be his second horn. (Was his right horn for me, not sure if there's a distinction.) EDIT: Not sure if this is an issue on the overlay's end, or the Hunter's Notes in game giving incorrect info, but the breakable parts for Yian Garuga seem incorrect. In-game it marks Beak and Ears as separate breakable zones, but the overlay seems to be consolidating both of these into "Head" (seemed to be Beak breaking at 2nd flinch, Ears at 4th.) Related, in what I gather is a departure from previous games in the series, part breaks in MHW seem to be based purely on flinching the correct body part enough times. For example, All of the Raths' heads will break on the 2nd head flinch, while their wings and back take a single one each, all the way up to ridiculous ones like Kirin's horn reliably breaks at 14. Since I couldn't find this info anywhere and.... I enjoy random data... I've been gathering all the break points I can. When I get it complete, is that something you'd like me to forward to you to incorporate into SmartHunter?