| London Clay | |||||
| Living group | Earliest Record | Similar | Some | Vague | Possible relatives elsewhere |
| See cautionary note | similarity | similarity | Eocene and earlier | ||
| Paleognath/Lithornithid | P | 40 | |||
| Dving bird - petrel/duck | UC | 1 | 3 | UC | |
| Petrel | LE N | 2 | 1 | ||
| Pseudodontorn | LE N | 1 | |||
| Tropicbird | LE N | 1 | |||
| Ibis mosaic | LE N | 4 | ME Europé | ||
| Screamer | LE N | 7 | 5 | LE N. America | |
| Swan | LE N | 1 | |||
| Duck | LE N | 8 | 1 | ||
| Hawk | LE N | 1 | 1 | UE Europe | |
| Accipitrine/coraci mosaic | LE N | 3 | |||
| Falcon/caracara | LE N | 1 | |||
| Osprey | LE N | 1 | |||
| Fowl/gamebird | LE N | 6 | 4 | ||
| Moundbuilder | LE N | 2 | UE Europe | ||
| Rail | UP | 2 | UP | ||
| Finfoot/mesite | LE N | 3 | |||
| Bustard | LE N | 4 | 3 | ||
| Gruiform/Charadriiform | LE N | 7 | LE N. America | ||
| Button-quail | LE N | 1 | 3 | ||
| Messelornithid (Messerrail) | ?P | 1 | UP Europe, LE N. America | ||
| Rail/wader | LE N | 7 | |||
| Pratincole/plover | LE N | 1 | |||
| Oystercatcher | LE N | 2 | |||
| Jacana | LE N | 5 | |||
| Thick-knee | LE N | 2 | |||
| Gull | LE N | 1 | |||
| Tern | LE N | 3 | |||
| Auk | LE N | 1 | |||
| Dove | LE N | 5 | 4 | 2 | |
| Pigeon/sandgrouse | LE N | ? | |||
| Parrot | LE N | 9 | 4 | ||
| Phorusrhacid | LE N | 5 | 2 | ||
| Touraco also Cuckoo-roller | LE N | 4 | 10 | LE Europe | |
| Hoatzin etc mosaic | LE | 3 | LE N. America | ||
| Cuckoo | LE N | 1 | |||
| Cuckoo/owl mosaic P. Olsoni | LE N | 17 | 4 | LE N. America | |
| Owl | MP | 4 | 9 | MP N. America | |
| Nightjar | LE N | 2 | ?LE N. America | ||
| Potoo/frogmouth etc | LE N | 2 | |||
| Oilbird | LE | 2 | LE N. America | ||
| Caprimulgiform | LE | 5 | 8 | LE N. America | |
| Swift | LE N | 1 | |||
| Crested swift | LE | 20 | 8 | LE N. America | |
| Early Swift | LE N | 2 | |||
| Trogon | LE N | 4 | 18 | 2 | |
| Mousebird | LE N | 4 | 4 | ||
| Coly mosaic | LE | ? | LE N. America | ||
| Coraciiform | LE | 20 | 5 | LE N. America | |
| Kingfisher | LE N | 2 | |||
| Roller-like | LE N | 2 | |||
| Tody | LE N | 2 | |||
| Motmot-like | LE N | 10 | 4 | ||
| Hoopoe | LE N | 14 | 1 | ME Europe | |
| Hoopoe mosaic ?sister group | LE N | 8 | |||
| Wood-hoopoe mosaic | LE N | 14 | 1 | LE N. America | |
| Perching bird mosaic | LE | 30 | 35 | LE N. America, ?Australia | |
| Passerine/coly etc mosaic | LE N | ? |