to cheep
The word 'pipiar' is a verb in Spanish that is often used to describe the sound that small birds make, similar to 'cheep' or 'chirp' in English. Like many verbs, 'pipiar' can be conjugated in accordance with the subject of the sentence, following Spanish conjugation rules.
The bird starts chirping at dawn.
In this context, 'pipiar' means to chirp, as it refers to the sound that a bird makes, typically early in the morning, or whenever they are active.
I can't concentrate with all this chirping around me.
Here, 'pipiar' refers to the chirping sounds that may be distracting the speaker. It communicates the same idea like in an English context, where 'chirping' can be disruptive if one needs silence to concentrate.
I like listening to the chicks chirping in their nest.
In this phrase, 'pipiar' again refers to the chirping sounds that the chicks make. It is an expression of the enjoyment some people derive from listening to nature sounds, like birds chirping.