A NOVEL WAY TO MONITOR NESTS USING MOTUS TAGGED BIRDS AND A CTT NODE.

Edwin Jacobo; Washington State University/Southern Sierra Research Station; edwin.jacobo@wsu.edu; Lauren Roux, Mary J. Whitfield, Nidia Jaime, Annie Meyer, Sasha Robinson, Pat Lorch

Nest monitoring is critical to understanding the drivers of population dynamics in avian species. For some bird species, nests can be difficult to find or monitor due to multiple factors such as secretiveness, sensitivity to visitors around the nest, and nest height and concealment. Yellow-billed Cuckoos (Coccyzus americanus,YBCU) frequently fall into several of these categories because their nests are well concealed and often located greater than 8 m high, while adults show secretive breeding behavior and can be sensitive to people near their nests. These factors often result in prohibitive personnel costs to find their nests and monitor their nesting behavior. In 2024, we tagged a YBCU with a Motus CTT HybridTag and used behavioral observation and hand tracking to locate the tagged cuckoo’s nest. Next, we placed a CTT radiotelemetry node 17 meters from the nest to monitor nesting behavior that was corroborated by field observations. This resulted in high temporal resolution data of cuckoo nesting behaviors, such as incubation timing, foraging and nestling feeding frequency, and nesting success. This approach provided invaluable nesting behavioral information and revealed nodes as a valuable tool for studying breeding birds while minimizing costs and observer disturbance around nests.

Poster Session