MINNEAPOLIS, Minn. — It’s one thing to take down Eagles, Seahawks and Falcons on the playing field, but the Minnesota Vikings and National Football League face a blitz of criticism for a nearly $1 billion stadium in the works that nature lovers call a “death trap” for real birds.

Critics warn the stadium’s enormous glassy exterior will reflect the sky, turning it into a fatal attraction for thousands of birds a year.

“We think it’s a travesty to use birds to advance your brand and then kill them over what amounts to pocket change for your organization,” said Dr. Christine Sheppard, bird collisions campaign manager for the American Bird Conservancy, in a statement.