I used have a budgerigar just like that when I was a lad and I taught him to say a few very basic phrases.
The bird in the picture is an immature or a female. Males have a blue cere (nose / nostrils)
Wikipedia says: -
The budgerigar (Melopsittacus undulatus), also known as common pet parakeet or shell parakeet and informally nicknamed the budgie, is a small, long-tailed, seed-eating parrot. Budgerigars are the only species in the Australian genus Melopsittacus, and are found wild throughout the drier parts of Australia where the species has survived harsh inland conditions for the last five million years. Budgerigars are naturally green and yellow with black, scalloped markings on the nape, back, and wings, but have been bred in captivity with colouring in blues, whites, and yellows, greys, and even small crests. Budgerigars are popular pets around the world due to their small size, low cost, ability to mimic human speech, and playful nature.
The budgerigar is closely related to the lories and the fig parrots. Although budgerigars are often, especially in American English, called "parakeets", this term actually refers to any of a number of small parrots with long, flat tails. The origin of the budgerigar's name is unclear, but the species was first recorded in 1805. In both captivity and the wild, budgerigars breed opportunistically and in pairs. Like most parrots, budgerigars are noted for their mimicry.
