TY  - GEN
AU  - SIMPSON,G G
TI  - Are nonflying sings functionless?
SN  - 0036-8075
PY  - 2004///0215
KW  - Animals
KW  - Birds
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1126/science.112.2908.342
ER  -