It depends on the bird. Different species make different sounds.
Stereotypically, birds go "tweet tweet". Which scientifically isn't true at all.
bird sound is called called churping
Literally.
The bird meets the fish by the bird EATING the fish that's literally the meeting
Bird song
A bird whistle
Hachidori (literally: bee bird)
Turkey
"Peep" is a palindrome often used to describe the sound of a baby bird.
There isn't one, but you can literally say "blue bird" by combining blue "aoi" and bird "tori" together.
they sound like a bird
The bird species that produces a sound similar to that of a cricket is the Common Nighthawk.
The bird that makes a sound resembling a laughing monkey is the kookaburra.