It also has this description: 'He thinks he is a girl and he spits eggs from his mouth.' This reference indicates that there may have been a mistake with Birdo's gender. In the instruction booklet, Birdo's name is accidentally swapped with the Ostro monster. After the third hit, she will give up the crystal ball.

Then when the time is right, throw it back at her. When she fires an egg, quickly jump up and land on top of it, and press to pick it up. Otherwise, you will have to give her a taste of her own medicine by catching the eggs that she spits at you and tossing them back at her. Normally, you may not have anything at your disposal to throw at her, but if there are Mushroom Blocks available, you can use those. You'll have to convince her to let them go by hitting her three times. Birdo prizes the crystal globes that are needed to exit through the gates that connect each world. Both red and green Birdos perform a small hop between their shots. Green Birdos will shoot nothing but three fireballs at you. Red Birdos can shoot three eggs at a time, but they may spit fire at you as well.

Pink Birdos can only shoot one egg at a time. There's actually a variety of Birdos that you will encounter. Birdo is the boss that you will face more often than any other boss.

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