Bye, bye Birdie.

Mayor de Blasio is pecking away at his predecessor’s legacy, this time clipping the wings of a symbolic bird created by the Bloomberg administration to promote sustainability.

Birdie’s name was scrubbed from the environmental mascot’s own social media accounts on March 2 and replaced with GreeNYC, the marketing program where the feathered rep works.

“Is Birdie gone? If so so am I! Will fly the coop!” one Facebook fan commented after the change. “Don’t let Birdie go !” another begged.

“BRING BACK BIRDIE” a devoted Birdie watcher tweeted on Wednesday from a new account that hijacked the old @Birdie_NYC handle.

The Birdie persona – complete with an actual 2D Monk parakeet costume and various accessories city staffers wear – was created with a graphic design agency during the Bloomberg administration in 2007. With thousands of fans, Birdie was a prolific tweeter and regularly posted photos of itself around town pushing green habits.

“Let’s get this week rolling!” a skateboarding Birdie tweeted on Jan. 22. “I think I can see Friday waaaay over there!” Birdie posted on Facebook the same day, with a picture of itself next to waterside binoculars.

Birdie’s Twitter, Facebook and Instagram then went dark for five weeks until the account names were changed.

“I want to help tackle climate change but I also want to help tackle the person who thought it was a good idea to make you go away,” another Facebook user wrote last week.

“The mayor is a typical insecure politician — he doesn’t want anyone else to be a star,” said a former government official who worked closely with Birdie.

The GreeNYC website notes 45 percent of New Yorkers were familiar with Birdie’s image in a survey. City Hall claims the changes are meant to make the mascot and GreeNYC more effective.

“I want to dispel any notion that the administration is distancing itself from Birdie,” emailed Michael Shaikh of the Mayor’s Office of Recovery and Resiliency. “Birdie is a critical part of our GreeNYC program that helps engage New York City residents in the fight against climate change. We need to act with greater urgency given the dramatic impacts of climate change we are witnessing almost every day.”

Still, de Blasio has never fully embraced the Bloomberg-era holdover.

While the mascot attended City Hall softball games, Birdie has only “formally” appeared at an event with de Blasio once, on Earth Day 2014 during the mayor’s first year in office, Shaikh said. On Earth Day 2015, the Birdie costume was spotted in a bag getting dragged from City Hall.