Definitions from Wiktionary (protobird)
▸ noun: (informal) Any of several extinct animals proposed as an evolutionary link between fossil reptiles and fossil birds; a proavian.
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▸ noun: (informal) Any of several extinct animals proposed as an evolutionary link between fossil reptiles and fossil birds; a proavian.
Similar:
protofeather,
prophaethontid,
paravian,
presbyornithid,
paraortygid,
enantiornithine,
ornithodiran,
ornithoid,
prionopid,
ornithuromorph,
more...
Opposite:
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