Yoshi's Egg

In most games featuring Yoshis, Yoshi eggs are involved. Yoshies are known for being capable of laying eggs at will, sometimes with Yoshies or items inside.

When Mario or Luigi collect one of these in Super Mario World, a Yoshi hatches and they can ride it. On Yoshi, they can swallow enemies with the X or Y button. In Yoshi's Island, Yoshi lays eggs by swallowing enemies. In Yoshi Touch and Go, he lays eggs when he collects fruit. The eggs can be used to collect items and defeat enemies. His eggs can be used as a weapon in Super Smash Bros.. In the Mario Kart games, the egg is used to hit your enemies in front of you and send out random items, like a Super Mushroom, in the air. You'll never know what will come flying at you next!

In Mario & Luigi: Partners in Time, a special type of Yoshi Egg, the "Smash Egg" is used as a Bros. Item. These large eggs are covered with a star pattern, and the Bros. somersault-kick into them to literally smash them into foes. After multiple hits, the egg will crack apart and may reveal a prize.