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?
keeping members of a flock in contact. Other authorities such as Howell and Webb (1995) make the distinction based on function, so that short vocalizations, such as those of pigeons, and even non-vocal sounds, such as the drumming of woodpeckers and the "winnowing" of snipes' wings in display flight, are considered songs. Still others require song to have syllabic diversity and temporal regularity akin to the repetitive and transformative patterns that define music. It is generally agreed upon in birding and ornithology which sounds are
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