Mating season is from January to May. Females, alone, incubate around 1-2 eggs at a time. After incubation, which can last around 15 days, the eggs hatch. Fledging occurs 15 days after hatching. A juvenile reaches sexual maturity in less than 1 month, but will not mate until the following year. The mortality rate is high in oropendolas because depredation occurs often by toucans, snakes, monkeys, and botfly larvae. Females will mate up to three times during the season, but less than one half percent of the chicks live past hatching (Kraucunas 1996; Jaramillo and Burke 1999).
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