The Yellow Bulborb is a extinct species of Bulborb that once lived on PNF-404. These Bulborbs were found within fossil records of the planet during its expeditions.
These Bulborbs are, as the name suggests, are yellow with black spots dotting its backside. It's also relatively smaller than most other Bulborbs. Little else is known about it, but given its surviving relatives, it probably behaved the same way.