That is a simile. Jenny is a bird is a metaphor.
They are known as little bird.
The albatross. Also known as the goony-bird.
The phrase 'a jenny' is used as a name for:a female bird ora female donkeyTherefore, 'a jenny' referring to a female donkey, would be used to carry a person or belongings.But wait, there's more....A 'Jenny' is also a nickname for a WWI-era biplane, and also for a 'Genoa jib sail'!See the related link listed below for even moreinformation:
The roadrunner (also known as the chaparral bird) is the official state bird of New Mexico.
The Pepper-bird, also known as the Garden Bulbul is the national bird of Liberia.
It was the great footballer Garincha. Or the wren.
It is the Lapwing also known as the Green Plover and also the Peewit. Pyewipe and Peewit being interpretations of the bird call it makes.
Puffin
A female swan
The Great Grey Owl, also known as the Lapland Owl.
A female swan