Here’s the list of bird species seen by Tom in Massachusetts and on Plum Island in 2020. All birds on the list were seen in Massachusetts. Birds in boldface were also seen on Plum Island. Birds in pink are life birds. There are 236 species on the list, with 231 on Plum Island, and 1 life bird.
| Snow Goose | Buff-breasted Sandpiper | Great Horned Owl | Red Crossbill |
| Greater White-fronted Goose | Pectoral Sandpiper | Snowy Owl | White-winged Crossbill |
| Brant | Semipalmated Sandpiper | Short-eared Owl | Pine Siskin |
| Canada Goose | Western Sandpiper | Northern Saw-whet Owl | American Goldfinch |
| Mute Swan | Short-billed Dowitcher | Belted Kingfisher | Lapland Longspur |
| Wood Duck | Long-billed Dowitcher | Yellow-bellied Sapsucker | Snow Bunting |
| Blue-winged Teal | American Woodcock | Downy Woodpecker | Lark Sparrow |
| Northern Shoveler | Wilson's Snipe | Hairy Woodpecker | Chipping Sparrow |
| Gadwall | Spotted Sandpiper | Northern Flicker | Clay-colored Sparrow |
| American Wigeon | Solitary Sandpiper | Crested Caracara | Field Sparrow |
| Mallard | Lesser Yellowlegs | American Kestrel | Fox Sparrow |
| American Black Duck | Willet | Merlin | American Tree Sparrow |
| Northern Pintail | Greater Yellowlegs | Peregrine Falcon | Dark-eyed Junco |
| Green-winged Teal | Wilson's Phalarope | Great Crested Flycatcher | White-crowned Sparrow |
| Ring-necked Duck | Parasitic Jaeger | Eastern Kingbird | White-throated Sparrow |
| Greater Scaup | Dovekie | Yellow-bellied Flycatcher | Seaside Sparrow |
| Lesser Scaup | Thick-billed Murre | Alder Flycatcher | Nelson's Sparrow |
| King Eider | Razorbill | Willow Flycatcher | Saltmarsh Sparrow |
| Common Eider | Black Guillemot | Least Flycatcher | Savannah Sparrow |
| Harlequin Duck | Bonaparte's Gull | Eastern Phoebe | Song Sparrow |
| Surf Scoter | Black-headed Gull | Northern Shrike | Lincoln's Sparrow |
| White-winged Scoter | Laughing Gull | Blue-headed Vireo | Swamp Sparrow |
| Black Scoter | Ring-billed Gull | Philadelphia Vireo | Eastern Towhee |
| Long-tailed Duck | Herring Gull | Red-eyed Vireo | Yellow-breasted Chat |
| Bufflehead | Lesser Black-backed Gull | Blue Jay | Bobolink |
| Common Goldeneye | Great Black-backed Gull | American Crow | Orchard Oriole |
| Barrow's Goldeneye | Least Tern | Common Raven | Baltimore Oriole |
| Hooded Merganser | Caspian Tern | Horned Lark | Red-winged Blackbird |
| Common Merganser | Black Tern | Bank Swallow | Brown-headed Cowbird |
| Red-breasted Merganser | Roseate Tern | Tree Swallow | Common Grackle |
| Wild Turkey | Common Tern | Purple Martin | Ovenbird |
| Pied-billed Grebe | Forster's Tern | Barn Swallow | Northern Waterthrush |
| Horned Grebe | Black Skimmer | Black-capped Chickadee | Black-and-white Warbler |
| Red-necked Grebe | Red-throated Loon | Tufted Titmouse | Tennessee Warbler |
| Rock Pigeon | Common Loon | Red-breasted Nuthatch | Orange-crowned Warbler |
| Mourning Dove | Cory's Shearwater | White-breasted Nuthatch | Nashville Warbler |
| Yellow-billed Cuckoo | Great Shearwater | Brown Creeper | Common Yellowthroat |
| Common Nighthawk | Northern Gannet | House Wren | American Redstart |
| Eastern Whip-poor-will | Great Cormorant | Marsh Wren | Cape May Warbler |
| Clapper Rail | Double-crested Cormorant | Carolina Wren | Northern Parula |
| Virginia Rail | American Bittern | Blue-gray Gnatcatcher | Magnolia Warbler |
| Sora | Least Bittern | Golden-crowned Kinglet | Bay-breasted Warbler |
| American Coot | Great Blue Heron | Ruby-crowned Kinglet | Blackburnian Warbler |
| American Avocet | Great Egret | Northern Wheatear | Yellow Warbler |
| Black-bellied Plover | Snowy Egret | Veery | Blackpoll Warbler |
| American Golden-Plover | Little Blue Heron | Gray-cheeked Thrush | Black-throated Blue Warbler |
| Killdeer | Tricolored Heron | Swainson's Thrush | Palm Warbler |
| Semipalmated Plover | Green Heron | Hermit Thrush | Pine Warbler |
| Piping Plover | Black-crowned Night-Heron | American Robin | Yellow-rumped Warbler |
| Whimbrel | Yellow-crowned Night-Heron | Gray Catbird | Black-throated Green Warbler |
| Hudsonian Godwit | Glossy Ibis | Brown Thrasher | Wilson's Warbler |
| Ruddy Turnstone | Turkey Vulture | Northern Mockingbird | Scarlet Tanager |
| Red Knot | Osprey | European Starling | Northern Cardinal |
| Stilt Sandpiper | Northern Harrier | Cedar Waxwing | Rose-breasted Grosbeak |
| Sanderling | Sharp-shinned Hawk | House Sparrow | Indigo Bunting |
| Dunlin | Cooper's Hawk | American Pipit | Dickcissel |
| Purple Sandpiper | Bald Eagle | Evening Grosbeak | |
| Baird's Sandpiper | Red-tailed Hawk | House Finch | |
| Least Sandpiper | Rough-legged Hawk | Purple Finch | |
| White-rumped Sandpiper | Eastern Screech-Owl | Common Redpoll |