Survival rates of parrotlet chicks form unmanipulated nests in which at least one nestling fledged, as a function of brood size and hatching order. Survival rates of early-hatched (first through antepenultimate) chicks from different brood sizes do not differ in their survival rates (χ²₃ = 0.59, P > 0.10), and have been pooled. Where rates of penultimate or last-hatched chicks differed significantly from the rate for earlier-hatched chicks (based on χ² tests with P ≤ 0.05, using program CONTRAST), the relative survival rate (q) is given