当用英语描述鹦鹉的特征时，我们可以从以下几个方面来描述：

外貌和颜色：

They have long, curved bills that are suitable for cracking seeds and nuts.

Many species have distinctive crests of feathers on their heads, which can be raised or lowered to express mood.

Parrots are renowned for their ability to mimic human speech and other sounds.

They have a wide vocal range and can produce complex vocalizations.

Some species, like the African Grey Parrot, are particularly adept at模仿 human speech.