Avialae
Avialae is a clade containing the only living dinosaurs, the birds, and their closest relatives. It is usually defined as all theropod dinosaurs more closely related to birds (Aves) than to deinonychosaurs, though alternative definitions are occasionally used.

Tiouraren (Y.-C. Tsai) · CC BY-SA 4.0 · via Wikipedia/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Also called
- avialanPBDB
- Sits inside
- ManiraptoraPBDB
- Diet
- carnivorePBDB, for Coelurosauria
- Life habit
- ground dwelling, solitaryPBDB, for Theropoda
- Motility
- actively mobilePBDB, for Theropoda
- Environment
- terrestrialPBDB, for Theropoda
Time the record covers
At least 165 million years on record.
The record covers at least 165.3 Mya to 11.7 ka. No occurrence read is dated outside 168.2 Mya to 0 Mya.
1,408 occurrences of Avialae on record, most of them in the Pleistocene. The Paleobiology Database records this as a living group. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
1,408 occurrences- Middle Jurassicunder 1%
- Late Jurassic1%
- Early Cretaceous10%
- Late Cretaceous22%
- Paleoceneunder 1%
- Eocene2%
- Oligoceneunder 1%
- Miocene6%
- Pliocene4%
- Pleistocene32%
- Holocene23%
These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
180 formations
- Jiufotang Formation · Jehol Group70
- Pierre Shale Formation · Montana Group46
- Vogel River Series Formation26
- Yixian Formation · Jehol Group25
- Niobrara Formation · Colorado Group22
- Bissekty Formation19
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The named rock units Avialae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 156 further formations hold fewer occurrences each and are not listed. 832 occurrences have no formation on record, which is common for older literature.
Avialae and its relatives
PleistoceneWhere Avialae and its relatives were recorded in the Pleistocene.
Found in the same rock
4,171 taxa- Mammalia29 sites
- Aves27 sites
- Bovidae25 sites
- Canis24 sites
- Osteichthyes24 sites
- Equus22 sites
- Theropoda21 sites
- Anura20 sites
- Phasianidae20 sites
- Lepus18 sites
- Teleostei18 sites
- Francolinus17 sites
- Gazella17 sites
- Enantiornithes16 sites
- Hyaenidae16 sites
- Hystrix16 sites
- Testudines16 sites
- Felis15 sites
- Rhinocerotidae15 sites
- Trionychidae15 sites
- Felidae14 sites
- Hipparion14 sites
- Tragelaphus14 sites
- Meleagris gallopavo13 sites
The Paleobiology Database records 893 sites for Avialae, and this reads 240 of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
619 references- Hesperornithiformes (Aves: Ornithurae) from the Upper Cretaceous Pierre Shale, Southern Manitoba, Canada41
- Birds in Finnish prehistory35
- Extinction, biogeography, and human exploitation of birds on Tikopia and Anuta, Polynesian outliers in the Solomon Islands30
- Laetoli: a Pliocene Site in Northern Tanzania26
- Late Pleistocene fossil birds from Buso Doppio del Broion Cave (North-Eastern Italy): implications for palaeoecology, palaeoenvironment and palaeoclimate22
- Prehistoric avifaunas from the Kingdom of Tonga21
- Quaternary fossil fauna of South Canterbury, South Island, New Zealand20
- Forty new specimens of Ichthyornis provide unprecedented insight into the postcranial morphology of crownward stem group birds18
- Taxonomic review of the late Cenozoic megapodes (Galliformes: Megapodiidae) of Australia18
- Birds from Sime del Elefante, Atapuerca, Spain: palaeoecological implications in the oldest human bearing levels of the Iberian Peninsula17
- A catalogue of British Pleistocene birds identified by Colin JO Harrison and stored in the Natural History Museum, London, (Department of Palaeontology)17
- Old and new fossil birds from the Spanish Miocene16
Each of the 1,408 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. 607 further references are not listed. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content1
Picture of Avialae
- Source
- Wikipedia/Commons
- Credit
- Tiouraren (Y.-C. Tsai)
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Avialae was found in MorphoSource and Sketchfab.
Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.
The description on this site
- Source
- Wikipedia, “Avialae”
- Licence
- CC BY-SA 4.0
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itManiraptora through timeFormations of the PleistoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Gauthier 1986