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. 2021 Oct 1;9:e12160. doi: 10.7717/peerj.12160

Figure 15. Close-up photographs of microanatomical details in the femora of altricial birds.

Figure 15

(A) Anna’s hummingbird pin-feathered chick (MVZ190799); (B) green-cheeked conure neonate (MVZ190895); (C) house finch neonate (MVZ190969); (D) Western scrub jay neonate (MVZ190927); (E) Anna’s hummingbird adult (MVZ190807); (F) green-cheeked conure adult (MVZ190917); (G) house finch adult (MVZ190993). (H) house finch pin-feathered chick showing inner circle of “floating” bone interpreted as evidence of a Kastschenko line. In all images the periosteal surface is oriented to the upper left and the endosteal to the lower right. Scale bar = 100 µm.