Micrococcus luteus is a Gram-positive, to Gram-variable, nonmotile, Coccus, saprotrophic bacterium that belongs to the family Micrococcaceae. It is urease and catalase positive.
Why is a mammoth more likely to fossilize than a caterpillar? A mammoth is more likely to fossilize than a caterpillar because a caterpillar has no hard tissue. Bones and cartilage are much more likely to fossilize. Edit
I found this beautiful photo of an adult Giant Leopard Moth on the Wikipedia website. Disappointingly, unknown to me, the caterpillar had become a host for a parasitic fly, which apparently had laid its eggs on or in the caterpillar before I got it. They hatched at this point and killed it.