Nest Boxes Save a Species | Cajas Nido Salvan una Especie

By Los Tiempos:

The Blue-throated Macaw Nest Box Program Breaks Historic Records

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Twenty years ago, the Blue-throated Macaw (Ara glaucogularis) Nest Box Program led by the Association Armonía recorded a single breeding attempt of this endemic species, which is critically endangered. Today, this initiative breaks historic records year after year. In the 2025 season, nineteen chicks successfully fledged, bringing the total number of young that have taken flight since the program began in 2005 to 164.

This result marks the second consecutive year with unprecedented figures for the conservation of the species: the 19 chicks that fledged in 2025 came from 12 nesting attempts and 32 eggs laid in the 128 artificial nest boxes installed in the Laney Rickman Reserve. The achievement confirms the effectiveness of a strategy that began as an experiment and is now one of the main tools for preventing the extinction of the species.

The progress is not isolated. In 2024, 17 chicks fledged, and in 2023, 15, showing a sustained trend of improvement in reproductive success. The impact is so significant that it is currently estimated that nearly one out of every four wild Blue-throated Macaws was born in a nest box installed by Armonía.

Of the 32 eggs laid this season, 24 chicks hatched, representing a hatching rate of 75%. Of these, 19 managed to fledge, reaching a 79% success rate among those that hatched. Six nests recorded complete survival from hatching to first flight, and one of them—PBA15—was the most productive, with four eggs that produced three chicks that successfully fledged.

These results contrast with past seasons in which, despite more eggs being reported, losses were greater. For example, during the 2022–2023 period, 46 eggs were documented in 14 nests, the highest number recorded up to that time. However, more than half failed to hatch, with egg mortality close to 56%. In contrast, the 2024–2025 season showed the opposite pattern: fewer eggs but significantly higher survival, which translated into a record number of chicks that successfully fledged.

The camera traps installed in the nest boxes revealed unexpected behavior this year: less competition with other species, but more territorial disputes among pairs of the same species. In one extreme case, a pair stopped feeding their chicks to confront another pair, which forced the team to intervene with supplementary feeding. Both chicks survived, successfully fledged, and were later accepted again by their parents.

Another episode revealed a curious detail of reproductive behavior: parents usually carve an oval exit hole in the artificial nest to facilitate their chicks’ first flight. One pair forgot to do so, and the ranger in charge of Laney Rickman, César Flores, intervened to enlarge the entrance, allowing the chick to leave the nest the following day.

Two decades of historic change

The accumulated data show a profound transformation. When the program began in 2005, only one nest was occupied and no chick survived. Two decades later, the nest boxes are not only frequently occupied, but they have also helped reverse competition with other species, improve chick survival, and produce individuals that now return to reproduce.

The Laney Rickman Reserve, established in 2018 in the Llanos de Moxos, has become a stronghold for the species. There, habitat protection, restoration of native palm groves, sustainable management of savannas, and environmental education are combined in a comprehensive conservation approach.

The program took 16 years to achieve its first 100 fledged chicks. At the current pace, it is expected to reach 200 before 2027, an acceleration that reflects the consolidation of technical and scientific work in the field.

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