SummaryWe report on what appear to be increasing predation events on nesting Thick-billed Parrots Rhychopsitta pachyrhyncha. Thick-billed Parrots are classified as ‘Endangered’ and their seasonal breeding range is restricted to increasingly fragmented and degraded high elevation mixed conifer forest habitat within the Sierra Madre Occidental region of north-western Mexico. Predation of established breeding pairs has recently contributed to the ongoing decline of Thick-billed Parrot populations by removing mature birds with high reproductive value, which has associated consequences for future recruitment. We observed increasing predation events on nesting Thick-billed Parrots by bobcats Lynx rufus accompanied by kittens throughout the 2018–2019 breeding seasons, and we speculate that recent reductions in bobcat habitat have pushed them into new ranges where they are supplementing their diet with nontraditional prey items.

中文翻译：

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墨西哥西北部山猫捕食筑巢厚嘴鹦鹉 Rhychopsitta pachyrhyncha

总结我们报告了关于筑巢厚嘴鹦鹉的捕食事件似乎正在增加厚鼻龙舌兰. 厚嘴鹦鹉被归类为“濒危”，它们的季节性繁殖范围仅限于墨西哥西北部马德雷山脉西部地区日益分散和退化的高海拔混合针叶林栖息地。对已建立的繁殖对的捕食最近通过去除具有高繁殖价值的成熟鸟类导致厚嘴鹦鹉种群的持续下降，这对未来的招募产生了相关后果。我们观察到山猫对筑巢厚嘴鹦鹉的捕食事件增加猞猁在整个 2018-2019 年的繁殖季节伴随着小猫，我们推测最近山猫栖息地的减少已将它们推向新的范围，在那里它们正在用非传统的猎物补充饮食。