The prehistoric avians weren't able to fly, but they were able to kill.

BIRDS
From foul-mouthed parrots to prison-breaking cats, these 25 animals are proof that “crime” can sometimes be cuddly.
There's a lot to love about these eccentric birds.
Don’t be fooled by their reputation for being thoughtless. Turkeys have a few tricks up their wings. Before tucking into your Thanksgiving dinner, read up on the bird you're about to gobble, gobble.
So far, the wild birds have caused $61,500 worth of damage, according to officials.
The solution to our cigarette waste problem may be right in front of us.
The trees want birds to disperse seeds—but sometimes kill them instead.
The bird gained viral fame after seeking refuge with a Houston cab driver.
The presumed remains of the ancient penguins are a “jumbled mixture” of bones from three modern species.
These interspecies friendships prove that anybody can get along if they really put their minds to it.
One hundred European starlings released in Central Park in 1890 have turned into 200 million across the U.S. today. Now scientists are looking into their genetic diversity.