From the Super Mario Wiki
Cheepy's mother is a large, purple Birdo wearing an orange bow and glasses; Cheepy's mother is also extremely near-sighted and is a character from The Super Mario Bros. Super Show! episode "The Bird! The Bird!".
In the beginning of the episode, Cheepy's mother, seeing Mario, Luigi, Toad and Princess Toadstool traveling through the Land of Ice, swoops downward and grabs Toad, mistaking him for her lost baby, Cheepy.
Flying to her home atop a tall mountain, she proceeded to drop a protesting Toad in a crib and begin to smother him with kisses, glad to have found her missing "baby". Ignoring Toad's claims that he's not her baby, Mother Birdo, after some difficulty, proceeded to answer a nearby ringing phone and told the caller, the Missing Bird Bureau, that she no longer needed them to search for Cheepy, as she had already found him. Hanging-up the phone, Mother Birdo attempted to give Toad more kisses and hugs as the as he frantically tried to run away.
Managing to eventually catch Toad, she proceeded to force-feed him milk from a bottle; forcing the bottle from his mouth, Toad tried to explain he wasn't Cheepy once again; ignoring Toad, Mother Birdo is suddenly reminded that its time for "Cheepy's" flying lessons by a nearby clock.
Grabbing Toad, she proceeded to fly through the air, attempting to reach 30 000 feet, with the plan of dropping Toad, expecting him to fly; eventually reaching the wanted altitude, she drops Toad, who manages to survive the fall by using his mushroom cap as a parachute.
Later, Cheepy's mother, after having the real Cheepy returned to her by Toad and Princess Toadstool, aids Mario and Luigi in their battle against King Koopa and his Koopa Troopa and Flurry minions by holding Mario and Toad in the air, as they dropped Turnip from a sack on King Koopa and his minions.
Having managed to drive King Koopa from the land, Cheepy's mother, still grateful to Toad, Mario, Luigi and Princess Toadstool for finding Cheepy, invites them to her home for some lunch. In the end, Mario, Luigi, Princess Toadstool and Toad flee from Mother Birdo and Cheepy's house after learning that their "lunch", were large, talking worms.