[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: BCF and BADD
>In a message dated 95-11-28 13:05:22 EST, NKING.UCS@smtp.usi.edu writes:
>>I hate to be a pest (like now), but I'm sort of new to this group. The=20
>>discussion of BCF and BADD is interesting, but what the heck are BCF and=
>>BADD? Like, what do the acronyms stand for? Can someone explain the two=
>>concepts in about ten words or less, each (really!)?
>BCF: Birds Came First.=20
>BADD: Birds Are Dinosaur Descendants.
>In BADD theory, it is argued that birds evolved from bipedal, cursorial
>theropods. In BCF, I argue that bipedal, cursorial theropods as well as
>modern birds evolved from a lineage of arboreal, birdlike ancestors. BADD
>says birds ran bipedally before they flew; BCF says birds climbed, glided,
>and flew but were always quite capable of running, either quadrupedally (in
>the early stages of the evolution of flight) or bipedally when grounded.
My turn to be a pest:-)
All this centers around the assumption that flight evolved in the trees;=
from what I have read, the jury is still out on that one. Now it could be=
argued that the enlarged claw in dromaeosarus is a holdover from a=
cursorial ancestor, but this could just be using circumstancial evidence. =
What would happen to BCF and BADD if flight evolved on the ground?
Labrynthodonts: Amphibians that lived with the Minitaur!