Birdo's Egg

Birdo Eggs are projectile eggs spat out of the mouths of Birdos as a means of attack. They can be plain white, but have also been shown to have pink spots in some appearances. In Super Mario Bros. 2, characters could jump on Birdo eggs and be transported horizontally through the air on them until the egg hits a wall, or is picked up by the character. In Mario Kart: Double Dash!! the eggs explode upon impact with any surface that isn't the race track, releasing three items from inside it.

In various video games, the Birdo Egg appears as Birdo's emblem, which is later replaced by her bow.

Super Mario Bros. 2
Birdos and their eggs made their first appearance in the American release of Super Mario Bros. 2 (and in the Japanese-only game, Yume Kojo: Doki Doki Panic that it is based on). Here, Birdo Eggs were plain white and were spat by Birdo at her adversaries, Mario, Luigi, Princess Toadstool and Toad, who would lose a life if they were hit. In some levels, the only way to damage Birdo was to pick up her eggs and throw them back at her.

In the remake, Super Mario Advance, in addition to a reappearance of normal Birdo Eggs, a giant variety shot by Robirdo was introduced. Apart from their size, they behaved exactly like normal Birdo Eggs: they could cause damage to the protagonists; or be ridden, picked up and thrown back at their sender to do damage to it instead.

Super Mario RPG: Legend of the Seven Stars
In Super Mario RPG: Legend of the Seven Stars, a Birdo hatched from a giant white egg known as Shelly. Birdo could speak to Mario through the eggshell, and requested a battle with him and his partners, and their attacks eventually split the egg open. Now hatched, the Birdo could attack Mario and the others with explosive Eggberts, rather than normal Birdo Eggs.

Mario Kart: Double Dash!!
In Mario Kart: Double Dash!!, Birdo appeared as a playable character, and her Special Items are Birdo Eggs. They behave the same as Birdo's counterpart, Yoshi's eggs, differing only in that they are covered in pink spots (Yoshi's are green). Once thrown, the eggs home in on the nearest character above Birdo and her racing partner in rank. Upon collision, the Birdo Egg breaks and releases three items at random, and the kart that was hit flips over. These items can include Bob-ombs, Stars, Mushrooms, Red or Green Shells, Fake Item Boxes, or Bananas. Birdo eggs will also break if they hit stray Bananas or Shells, or environmental hazards, and if they go long enough without hitting anything, they will self-destruct. King Boo and Petey Piranha can also use this, as they can use any special item.

Super Smash Bros. Melee
Birdo Eggs next appeared in Super Smash Bros. Melee, on the stage Mushroom Kingdom 2, which is a representation of Super Mario Bros. 2. Like in that game, Birdo (occasionally appearing from either side of the stage) shoots out the eggs, possibly damaging the fighters, who can also jump and ride on the eggs or grab them to use as projectiles against other combatants.

Mario Party DS
In Mario Party DS, a Birdo Egg appears as a card in the minigame Memory Mash. These looked the same as in Mario Kart: Double Dash!!, as they are Yoshi Eggs with pink spots instead of green.

Mario Super Sluggers
In Mario Super Sluggers, a Birdo Egg appears Birdo's Batting special move Cannon Swing, where she spit out an egg with pink bows printed on it. Then Birdo slams the egg with her bat, so hitting the baseball thrown by the pitcher, which breaks the egg. Meanwhile, the baseball goes with amazing power forwards, so hitting the pitcher.

Captain Rainbow
In Captain Rainbow, large, pink-spotted Birdo Eggs can be seen mounted on either side of Birdo's House.