Little Birdie

Unidentified Life Form 55 is a new, small, rodent-like creature seen in Metroid: Other M. Samus Aran encounters it after she leaves the Breeding Room in the Biosphere. It tries to get on top of a strange rock, presumably a type of fruit. It scurries off as Samus stares at it, but as she walks through a door opened by Adam, it is there again, as Samus slowly walks away.