Adam Bassett's 2020 year list
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| Species | Date | Location |
|---|
| Little Grebe | | |
| Great Crested Grebe | | |
| Cormorant | | |
| Little Egret | | |
| Great White Egret | 04/01 | LMGP |
| Grey Heron | | |
| Mute Swan | | |
| Greylag Goose | | |
| Canada Goose | | |
| Barnacle Goose | | |
| Egyptian Goose | | |
| Shelduck | | |
| Mandarin Duck | | |
| Wigeon | | |
| Gadwall | | |
| Teal | | |
| Mallard | | |
| Pintail | 21/01 | LMGP |
| Garganey | ********** | ********** |
| Shoveler | | |
| Red-crested Pochard | 25/02 | LMGP |
| Pochard | | |
| Tufted Duck | | |
| Common Scoter | | |
| Goosander | ********** | ********** |
| Red Kite | | |
| Sparrowhawk | | |
| Buzzard | | |
| Osprey | 05/04 | LMGP |
| Kestrel | | |
| Hobby | | |
| Peregrine | | |
| Red-legged Partridge | | |
| Grey Partridge | | |
| Pheasant | | |
| Water Rail | | |
| Moorhen | | |
| Coot | | |
| Oystercatcher | | |
| Little Ringed Plover | 18/03 | LMGP |
| Ringed Plover | 08/07 | Dorney Common |
| Golden Plover | | |
| Lapwing | | |
| Dunlin | 01/05 | LMGP |
| Ruff | 03/10 | LMGP |
| Snipe | | |
| Woodcock | 25/01 | LMGP |
| Black-tailed Godwit | 26/07 | LMGP |
| Bar-tailed Godwit | 18/04 | LMGP |
| Whimbrel | 05/04 | LMGP |
| Common Sandpiper | | |
| Green Sandpiper | | |
| Redshank | | |
| Red-necked Phalarope | 07/06 | LMGP |
| Black-headed Gull | | |
| Mediterranean Gull | 24/07 | LMGP |
| Common Gull | | |
| Lesser Black-backed Gull | | |
| Herring Gull | | |
| Yellow-legged Gull | | |
| Caspian Gull | | |
| Great Black-backed Gull | | |
| Common Tern | | |
| Arctic Tern | 18/04 | LMGP |
| Rock Dove / Feral Pigeon | | |
| Stock Dove | | |
| Woodpigeon | | |
| Collared Dove | | |
| Ring-necked Parakeet | | |
| Cuckoo | | |
| Barn Owl | | |
| Tawny Owl | | |
| Short-eared Owl | ********** | ********** |
| Swift | | |
| Kingfisher | | |
| Green Woodpecker | | |
| Great Spotted Woodpecker | | |
| Woodlark | | |
| Skylark | | |
| Sand Martin | | |
| Swallow | | |
| House Martin | | |
| Tree Pipit | 24/08 | Marlow Bottom |
| Meadow Pipit | | |
| Yellow Wagtail | | |
| Grey Wagtail | | |
| Pied Wagtail | | |
| Wren | | |
| Dunnock | | |
| Robin | | |
| Redstart | 12/04 | Marlow Bottom |
| Whinchat | | |
| Stonechat | | |
| Wheatear | | |
| Ring Ouzel | 17/10 | Little Marlow |
| Blackbird | | |
| Fieldfare | | |
| Song Thrush | | |
| Redwing | | |
| Mistle Thrush | | |
| Cetti's Warbler | | |
| Sedge Warbler | | |
| Reed Warbler | | |
| Blackcap | | |
| Garden Warbler | | |
| Lesser Whitethroat | | |
| Whitethroat | | |
| Dartford Warbler | | |
| Chiffchaff | | |
| Willow Warbler | | |
| Goldcrest | | |
| Firecrest | 02/03 | Marlow Bottom |
| Spotted Flycatcher | | |
| Long-tailed Tit | | |
| Blue Tit | | |
| Great Tit | | |
| Coal Tit | | |
| Marsh Tit | | |
| Nuthatch | | |
| Treecreeper | | |
| Jay | | |
| Magpie | | |
| Jackdaw | | |
| Rook | | |
| Carrion Crow | | |
| Raven | | |
| Starling | | |
| House Sparrow | | |
| Chaffinch | | |
| Brambling | | |
| Greenfinch | | |
| Goldfinch | | |
| Siskin | | |
| Linnet | | |
| Lesser Redpoll | | |
| Common Crossbill | | |
| Bullfinch | | |
| Yellowhammer | | |
| Reed Bunting | | |