Other causes of nesting failure included: infestation by botfly Philornis pici ( n = 6), infertile eggs ( n = 5), death of young nestlings from exposure during heavy rains and winds ( n = 4), and nests falling to the ground due to a broken supporting palm frond ( n = 4). Further causes of nest failure suspected by the authors but not confirmed were: predation by Red-tailed Hawk, Stygian Owl Asio stygius , and Hispaniolan boa Epicrates striatus .