the pigeon enters vs the Pigeon enter

Some examples from the web:

• Lovely place to feed the pigeons.
• All the pigeons overhead starting to turn into vultures.
• And will now imprint onto the pigeon.
• Throw a cat among the pigeons.
• The pigeons are only on Osawa's veranda.
• The pigeon is a tenant named Terence Huntley.
• You want to put a cat among the pigeons.
• All thanks to the pigeons and the sparrows.
• The pigeons of Boston are fat and proud.
• The robins are singing, the pigeons cooing...
• Hassan will prepare the pigeon in truffle sauce. Alone.
• Now put the pigeon's tail towards me.
• Miss Towler's put the cat amongst the pigeons.
• The pigeon, growing fatigued witeach flap of her taxidermied wing, knew something The others did not.
• Hello. This is the pigeon from the balcony calling to apologize.
• It was me, the pigeon.
• 50 to the man who kills the pigeon.
• Be up with the pigeons Flying away, down home...
• The pigeons in Venice are still frightened.
• She might meet the pigeon of her life tonight.

Some examples from the web:

• Lovely place to feed the pigeons.
• All the pigeons overhead starting to turn into vultures.
• And will now imprint onto the pigeon.
• Throw a cat among the pigeons.
• The pigeons are only on Osawa's veranda.
• The pigeon is a tenant named Terence Huntley.
• You want to put a cat among the pigeons.
• All thanks to the pigeons and the sparrows.
• The pigeons of Boston are fat and proud.
• The robins are singing, the pigeons cooing...
• Hassan will prepare the pigeon in truffle sauce. Alone.
• Now put the pigeon's tail towards me.
• Miss Towler's put the cat amongst the pigeons.
• The pigeon, growing fatigued witeach flap of her taxidermied wing, knew something The others did not.
• Hello. This is the pigeon from the balcony calling to apologize.
• It was me, the pigeon.
• 50 to the man who kills the pigeon.
• Be up with the pigeons Flying away, down home...
• The pigeons in Venice are still frightened.
• She might meet the pigeon of her life tonight.