Here’s the list of bird species seen by Tom in Massachusetts and on Plum Island in 2021. All birds on the list were seen in Massachusetts. Birds in boldface were also seen on Plum Island. There are 74 species on the list, with 71 on Plum Island.
| Brant | Wild Turkey | Red-tailed Hawk | Gray Catbird |
| Canada Goose | Horned Grebe | Rough-legged Hawk | Northern Mockingbird |
| Mute Swan | Red-necked Grebe | Eastern Screech-Owl | European Starling |
| Gadwall | Rock Pigeon | Great Horned Owl | House Sparrow |
| Mallard | Mourning Dove | Snowy Owl | House Finch |
| American Black Duck | Sanderling | Short-eared Owl | Common Redpoll |
| Northern Pintail | Dunlin | Red-bellied Woodpecker | Red Crossbill |
| Green-winged Teal | Purple Sandpiper | Downy Woodpecker | American Goldfinch |
| Greater Scaup | Razorbill | Hairy Woodpecker | Snow Bunting |
| Common Eider | Black-legged Kittiwake | Merlin | American Tree Sparrow |
| Harlequin Duck | Ring-billed Gull | Peregrine Falcon | White-throated Sparrow |
| Surf Scoter | Herring Gull | Blue Jay | Song Sparrow |
| White-winged Scoter | Great Black-backed Gull | American Crow | Swamp Sparrow |
| Black Scoter | Red-throated Loon | Common Raven | Northern Cardinal |
| Long-tailed Duck | Common Loon | Horned Lark | |
| Bufflehead | Northern Gannet | Black-capped Chickadee | |
| Common Goldeneye | Great Egret | Tufted Titmouse | |
| Barrow's Goldeneye | Northern Harrier | Red-breasted Nuthatch | |
| Hooded Merganser | Cooper's Hawk | Hermit Thrush | |
| Red-breasted Merganser | Bald Eagle | American Robin |