A Common Occurence
A Bill Drill Object is a rock or boulder in Banjo Tooie. It can only be destroyed with Kazooie's Bill Drill move. They are found in: Spiral Mountain, Isle O' Hags, Mayahem Temple, Glitter Gulch Mine, Jolly Roger's Lagoon, Terrydactyland, and Cloud Cuckooland.
Sneaky Little Rocks
These rocks are famous for hiding important objects like a Flight Pad, and in Glitter Gulch Mine it is not uncommon for them to be on top of an entrance to the tunnels below. These rocks are actually hardly noticeable in Glitter Gulch Mine, as the entire world has some sort of rock-color tint to it.