I've heard the phrase bird vocalization before but I really don't know exactly what it means.
Its not a common theme but it refers to bird calls and bird songs
Made by the birds themselves correct"
Made by the bird themselves but I guess if a human could mimic it then it should count also. Its a bird sound that is melodious to human ears.
Ah okay, that's interesting. Especially how different birds have different calls and for different things too.
There is a difference between songs and calls as its based on its length and context and complexity.
So what are songs used for by birds?
Obviously the songs are longer and are primarily used for courtship or mating.
Ohh okay, yeah that would make the most sense.
songs and which are calls, and a good field guide will differentiate between the two.
Bird song is best developed in the order Passeriformes. Some groups are nearly voiceless, producing only percussive and rhythmic sounds, such as the storks, which clatter their bills. In some manakins (Pipridae), the males have evolved several mechanisms for mechanical sound production, including mechanisms for stridulation not unlike those found in some insects.
Song is usually delivered from prominent perches, although some species may sing when flying. The production
refusal, he later varies it in comic ways. For example, he renders the phrase in colloquial terms in chapter 12 of "Joy in the Morning", when explaining to Nobby that he could not stand up to Florence:
"And if you think I've got the force of character to come back with a "nolle prosequi"—""A what?""One of Jeeves's gags. It means roughly 'Nuts to you!' If, I say, you think I'm capable of asserting myself and giving her the bird, you