Enables growth factor binding activity and vascular endothelial growth factor-activated receptor activity. Involved in several processes, including circulatory system development; peptidyl-tyrosine autophosphorylation; and positive regulation of vasculogenesis. Acts upstream of or within several processes, including animal organ development; positive regulation of cell population proliferation; and vasculature development. Located in several cellular components, including cell junction; endosome; and external side of plasma membrane. Is expressed in several structures, including alimentary system; cardiovascular system; central nervous system; extraembryonic component; and genitourinary system. Human ortholog(s) of this gene implicated in several diseases, including adhesions of uterus; artery disease (multiple); gastrointestinal system cancer (multiple); macular degeneration (multiple); and pancreatic cancer (multiple). Orthologous to human KDR (kinase insert domain receptor).