Yes, the noun 'pigeons' is a common noun, the plural form of the noun 'pigeon'; a general word for a type of bird; a word for any pigeons of any kind.
No
falcons kill pigeons
Proper nouns are names. Unless you know a person or place named Pigeon, it's a common noun. Pigeon Forge, for example, is a proper noun using the word pigeon.
The collective nouns for pigeons are:a flock of pigeonsa flight of pigeonsa kit of pigeonsa passel of pigeons
The collective noun 'kit' is used for: a kit of pigeons.
The collective noun 'kit' is used for a kit of pigeons and a kit of tools.
The collective noun 'kit' is used for a kit of pigeons and a kit of tools.
The collective noun 'kit' is used for a kit of pigeons.
They are not extremely rare, but are less common than grey pigeons due to the brown/red coloration being recessive. Brown pigeons are specially bred as pets, and are a common color of show pigeon.
common noun
Nothing
Pigeons
The correct spelling of the plural noun is pigeons (urban birds).