Vast scourges of seagulls routinely wreak havoc on coastal families, beach gatherings, and happiness in general, but apparently they’ve found a new target to annoy the shit out of: our future fleet of robot cars.

The is reporting that the creatures have proved to be a difficult little thing for autonomous vehicles to handle. Last month, AV designer nuTonomy Inc. started . And while the car has been able to maneuver around an industrial park on Boston’s south side, driving about 100 miles, it’s having a hard time with sea gulls.

Because of fucking course seagulls are causing a problem. From the Globe:

“One bird is often small enough that the car assumes it can be ignored. But when you have a flock of birds together, it looks like a big object, so we’ve had to train the car to recognize the birds,” nuTonomy chief executive Karl Iagnemma said. “It wasn’t something really that we’ve seen before.”

The vehicle, which has a human in the driver seat to take control as needed, reacts to the flocks the same way a human might: it slows down while approaching the birds until they fly away, and then resumes its normal way. It generally slows for any unrecognized object

The vehicles slow down for any objects it doesn’t recognize, the newspaper says, and they’ll trudge along slowly while approaching a flock of the nasty, constantly-pooping ocean birds.

Iagnemma said it’s important to teach the car’s software to recognize the birds for what they are, to “give the vehicle a better capability to predict what’s going to happen next.” The company teaches the vehicle to recognize new objects by continually feeding imagery of the object into an algorithm. Other examples include MBTA buses and recumbent cycles, which riders pedal while seated in a reclined position.

Iagnemma told the newspaper the company didn’t encounter sea gulls while conducting AV tests in Singapore, but the birds show that new settings bring new challenges.

Like blizzards in the Rust Belt, or torrential downpours anywhere. But add this to the laundry list of .