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Type: Journal article
Title: Blood flow rates to leg bones of extinct birds indicate high levels of cursorial locomotion
Author: Hu, Q.
Miller, C.V.
Snelling, E.P.
Seymour, R.S.
Citation: Paleobiology, 2023; 1-12
Publisher: Cambridge University Press (CUP)
Issue Date: 2023
ISSN: 0094-8373
Statement of
Qiaohui Hu, Case Vincent Miller, Edward P. Snelling, and Roger S. Seymour
Abstract: Foramina of bones are beginning to yield more information about metabolic rates and activity levels of living and extinct species. This study investigates the relationship between estimated blood flow rate to the femur and body mass among cursorial birds extending back to the Late Cretaceous. Data from fossil foramina are compared with those of extant species, revealing similar scaling relationships for all cursorial birds and supporting crown bird–like terrestrial locomotor activity. Because the perfusion rate in long bones of birds is related to the metabolic cost of microfracture repair due to stresses applied during locomotion, as it is in mammals, this study estimates absolute blood flow rates from sizes of nutrient foramina located on the femur shafts. After differences in body mass and locomotor behaviors are accounted for, femoral bone blood flow rates in extinct species are similar to those of extant cursorial birds. Femoral robustness is generally greater in aquatic flightless birds than in terrestrial flightless and ground-dwelling flighted birds, suggesting that the morphology is shaped by life-history demands. Femoral robustness also increases in larger cursorial bird taxa, probably associated with their weight redistribution following evolutionary loss of the tail, which purportedly constrains femur length, aligns it more horizontally, and necessitates increased robustness in larger species.
Description: OnlinePubl
Rights: © The Author(s), 2023. Published by Cambridge University Press on behalf of The Paleontological Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (, which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
DOI: 10.1017/pab.2023.14
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Appears in Collections:Medical Sciences publications

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