BOSTON, MA — On Thursday, a Bakersfield Street resident phoned the Animal Rescue League of Boston with a distressing story: her cat had fallen sick, and she had seen birds falling from the trees.

The ARL arrived in her Dorchester neighborhood to administer emergency treatment to the cat, but said it could not be saved. Nearby, the ARL said it found 47 birds either falling to the ground, sick, thrashing and unable to fly, or simply unresponsive. At least three cats may also have been affected, the City of Boston's Inspectional Services Department said Friday. ARL is warning neighbors to keep their pets away from the area of 33 Bakersfield Street.

According to the ARL: 12 of the grackles were found dead; eight perished en route to the shelter; another 12 have since been euthanized "due to their poor condition"; and 15 remain in good health, under the care of its veterinary team. The birds that died have been sent to Tufts University for testing; the living birds are being sent to the Tufts Wildlife Center in Grafton.