This is the 2398th most frequent Swedish word.
fåglar
Birds.
Here, 'fåglar' is a noun referring to the general plural form of 'bird'.
Fåglar flyger högt på himlen.
Birds fly high in the sky.
In this sentence, 'fåglar' again is a plural noun, used to describe multiple types of birds.
Jag såg många olika färgade fåglar i parken.
I saw many different colored birds in the park.
Here, 'fåglar' is used generally to represent birds engaging in the action described.