Species, GC (%), AT (%), G (bases), C (bases), A (bases), T (bases), Maximum lifespan (yrs) Apus apus, 44.6, 55.4, 68, 7, 36, 57, 21.1, Archilochus colubris, 38.0, 62.0, 56, 9, 41, 65, 9.1,