TERRELL HILLS, Texas -- A tree trimmer was working on a tree in the 100 block of Lilac Lane in Terrell Hills when a swarm of bees attacked him and immediately started stinging.

Neighbors say it's not a normal bee colony, like they are used to. They enjoy seeing the bees on their flowers and one neighbor is a beekeeper. But the tree trimmer must have agitated the colony.

Bees can be aggressive when provoked. Resident Mary Ann Summitt shared the tree trimmer's story with Spectrum News. 

"He had 200 stings on his body," Summitt said.  "He was allergic, and so the EMS took him to the hospital. He's fine now. I know - I checked this morning. He jumped in the pool of the neighbors to get away from them."

Neighbors said it was an isolated and rare incident. But they are being careful.

Residents were advised to stay inside while bee keepers cleared the area.

"Bees we're used to - just not Africanized bees, which I assume those are," Summitt said. 

"Africanized ones, they lean more towards making sure you can't come back to be a threat in the future," said Blake Kennedy with Beeline Pest Control

Kennedy also said swarm attacks are rare, but recently they've seen more bee attack reports.

In Uvalde a swarm of angry bees sent three people to the hospital. In the Austin area, a beehive sent a man to the hospital with over 160 stings.

A possible reason we're seeing more is because bees migrate twice a year.

"They just kinda fly until they get tired and pick a spot to land in - a big clump of bees, a lot of times up to the size of a basketball or a beach ball even," Kennedy said. 

The first season is in early spring and the second is right about now.

Experts say if you see a large swarm of bees, leave them alone.