The bird was smuggled into the Mets clubhouse after closer Frank Francisco called the Yankees "chickens" on Thursday.
"I told him [Francisco] the Yankees sent it over for him. He had a look of concern," said Byrdak.
The name Jeter didn't last long — and the team decided to rename the feathered mascot.
"We're going to call him Little Jerry Seinfeld," said team prankster Byrdak— in a nod to the episode of "Seinfeld" which Kramer buys a what he thinks is an egg-laying hen but turns out to be a cockfighting rooster.
Seinfeld weighed in on his bird-brained namesake last night and told The New York Post," As much as I enjoy the Byrdak humor, he should be aware Little Jerry Seinfeld is no chicken."
Byrdak said he had a buddy buy the bird from a poultry market in Chinatown and believes it helped the Mets win the first game of the Subway Series Friday night.
Last night, Little Jerry Seinfeld laid a big, fat egg and the Mets lost 4-3.
The chicken's 15-minutes of fame might be coming to an end, but Byrdak won't let Little Jerry end up in a KFC bucket.
"Does anyone live on a farm that could take a chicken off my hands?" Byrdak tweeted last night.
For now, the feathered friend was in a cage in "a restricted area" of the clubhouse.