Common grackles are a type of blackbird that measure 11-13.4 inches in length and weigh 2.5-5 oz. Starlings are one of the three most common nuisance birds, and they are slightly smaller, measuring 7.9-9.7 inches in length and weighing 2.1-3.4 oz. Any birds in this size range would fit inside the Tomahawk Double Door Starling Live Trap - Model 503.
The Tomahawk Starling Trap with Two Trap Doors - Model 503 can be used to trap starlings and other similar size birds. Starlings measure 7.9-9.7 inches in length and cowbirds range from 7.5 - 8.7 inches in length so yes, any birds in this size range would fit.
14 gauge wire mesh
Tomahawk Starling Trap with Two Trap Doors - Model 503 can be used to trap starlings and other similiar size birds. Sparrows range in size from 4-7" so it is possible they can be trapped in this trap also.