In a message dated 98-03-22 00:38:46 EST, tkeese1@gl.umbc.edu writes: << I don't see how that's so... BCF says that the lineage from basal dinosaurs to modern birds were small, arboreal/scansorial creatures that spit off larger terrestrial lineages, right? Alvarezsaurids would just be another one of these lineages. >> Yep. You got it.