Species, GC (%), AT (%), G (bases), C (bases), A (bases), T (bases), Maximum lifespan (yrs) Apus apus, 47.0, 53.0, 272, 184, 199, 315, 21.1, Archilochus colubris, 47.4, 52.6, 269, 191, 189, 321, 9.1,