Two years ago, a farmer from Wubaiding Village, in northeastern China, came across a beautiful fossil. The only animal fossils that had ever been found at this site were a pair of salamanders, but when Min Wang from the Chinese Academy of Sciences saw the new specimen, he was sure it was a dinosaur.

Studying the beautifully preserved and nigh-complete skeleton, Wang took note of the creature’s sparrow-size body, the quill-like feathers on its neck, and its stubby tail. But when he looked more closely at the left arm, he saw a thin bone coming down from its wrist—a rod as long as the entire forearm, but not jointed like a finger. “I shouted, and my heartbeat elevated,” he says.

He knew he had found another bat-winged dinosaur.

Hold your arm out to the side, palm facing forward. Imagine a bony rod extending downward from your wrist. Now imagine that rod supports a membrane that stretches from your fingertips to your side. That’s how Wang saw his new dinosaur—a feathered animal with a pair of bat-like wings. He named it Ambopteryx longibranchum, from the Latin for “both wings, long upper arm.”

Read: Fossil of massive four-winged raptor found in China

Ambopteryx is actually the second bat-winged dinosaur to be found. The first was also spotted by a farmer in northeastern China, and eventually described in 2015 by Xing Xu and Xioating Zheng. Named Yi qi, after the Mandarin for “strange wing,” it also had a long wrist-rod that likely supported a leathery membrane.

He knew he had found another bat-winged dinosaur.

Hold your arm out to the side, palm facing forward. Imagine a bony rod extending downward from your wrist. Now imagine that rod supports a membrane that stretches from your fingertips to your side. That’s how Wang saw his new dinosaur—a feathered animal with a pair of bat-like wings. He named it Ambopteryx longibranchum, from the Latin for “both wings, long upper arm.”

Read: Fossil of massive four-winged raptor found in China

Ambopteryx is actually the second bat-winged dinosaur to be found. The first was also spotted by a farmer in northeastern China and eventually described in 2015 by Xing Xu and Xioating Zheng. Named Yi qi, after the Mandarin for “strange wing,” it also had a long wrist-rod that likely supported a leathery membrane.