The Breeding Room is a room in the Biosphere. It is full of plants, and Samus Aran seems suspicious when she first enters the room. She looks at the corpse of a Lab Worker, whose lab coat is stained with green blood. Samus states that the scientist was attacked by a different creature than the one who killed another scientist, as the latter was stained with green blood. She also states that she felt something in the air, a "dark intelligence".
It was later revealed that the room belonged to Little Birdie. MB states that the scientist was brutually slaughtered when little birdie played dead to lure him into his cage. Afterwards, the body was consumed and Little Birdie escaped.