Green Shell (Super Mario World)

The Green Shell is a unique item in Super Mario World.

Appearance
The Green Shell has a green back with a hole in the bottom for a Koopa to fit in.

Trivia

 * The Green Shell doesn't give Yoshi any special power, but it does make special blocks get activated.
 * Unlike the other shells, the Green Shell is common.
 * The Green Shell isn't something Mario/Luigi can absorb.
 * Mario/Luigi can get hit by a shell. Every single one in fact.