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Description
By far the smallest skeletal yet. Buitreraptor is a tiny (although not the tiniest, if Rahonavis is also in the group) and well-studied unenlagiine paravian from the Candeleros formation, which I've done a faunal chart of; it was probably preying on the littlest vertebrates as well as small and juvenile fish in shallow waters.

References:
- Makovicky, Peter J.; Apesteguía, Sebastián; Agnolín, Federico L. (2005). "The earliest dromaeosaurid theropod from South America". Nature. 437 (7061): 1007–1011.
-Gianechini, Federico A.; Makovicky, Peter J.; Apesteguía, Sebastián (2017-01-02). "The cranial osteology of Buitreraptor gonzalezorum Makovicky, ApesteguÍa, and AgnolÍn, 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia, Argentina". Journal of Vertebrate Paleontology. 37 (1): e1255639. doi :10.1080/02724634.2017.1255639
-Novas, Fernando E.; Brissón Egli, Federico; Agnolin, Federico L; Gianechini, Federico A.; Cerda, Ignacio (2018-03-01). "Postcranial osteology of a new specimen of Buitreraptor gonzalezorum (Theropoda, Unenlagiidae)" . Cretaceous Research. 83: 127–167. doi :10.1016/j.cretres.2017.06.003 .
-Motta, Matías J.; Brissón Egli, Federico; Novas, Fernando E. (2018-03-01). "Tail anatomy of Buitreraptor gonzalezorum (Theropoda, Unenlagiidae) and comparisons with other basal paravians" . Cretaceous Research. 83: 168–181. doi :10.1016/j.cretres.2017.09.004 .
-Gianechini, Federico A.; Makovicky, Peter J.; Apesteguía, Sebastián; Cerda, Ignacio (2018-03-26). "Postcranial skeletal anatomy of the holotype and referred specimens of Buitreraptor gonzalezorum Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia" . PeerJ. 6: e4558. doi :10.7717/peerj.4558 .

Human silhouette from www.onlygfx.com/20-woman-silho…

Description
By far the smallest skeletal yet. Buitreraptor is a tiny (although not the tiniest, if Rahonavis is also in the group) and well-studied unenlagiine paravian from the Candeleros formation, which I've done a faunal chart of; it was probably preying on the littlest vertebrates as well as small and juvenile fish in shallow waters.

References:
- Makovicky, Peter J.; Apesteguía, Sebastián; Agnolín, Federico L. (2005). "The earliest dromaeosaurid theropod from South America". Nature. 437 (7061): 1007–1011.
-Gianechini, Federico A.; Makovicky, Peter J.; Apesteguía, Sebastián (2017-01-02). "The cranial osteology of Buitreraptor gonzalezorum Makovicky, ApesteguÍa, and AgnolÍn, 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia, Argentina". Journal of Vertebrate Paleontology. 37 (1): e1255639. doi :10.1080/02724634.2017.1255639
-Novas, Fernando E.; Brissón Egli, Federico; Agnolin, Federico L; Gianechini, Federico A.; Cerda, Ignacio (2018-03-01). "Postcranial osteology of a new specimen of Buitreraptor gonzalezorum (Theropoda, Unenlagiidae)" . Cretaceous Research. 83: 127–167. doi :10.1016/j.cretres.2017.06.003 .
-Motta, Matías J.; Brissón Egli, Federico; Novas, Fernando E. (2018-03-01). "Tail anatomy of Buitreraptor gonzalezorum (Theropoda, Unenlagiidae) and comparisons with other basal paravians" . Cretaceous Research. 83: 168–181. doi :10.1016/j.cretres.2017.09.004 .
-Gianechini, Federico A.; Makovicky, Peter J.; Apesteguía, Sebastián; Cerda, Ignacio (2018-03-26). "Postcranial skeletal anatomy of the holotype and referred specimens of Buitreraptor gonzalezorum Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia" . PeerJ. 6: e4558. doi :10.7717/peerj.4558 .

Human silhouette from www.onlygfx.com/20-woman-silho…