The Evening Grosbeak is a stocky finch with a massive bill. Males are yellow and black, while females are mostly gray.
Adult males are yellow and black with white wing patches. Females are mostly gray, with black-and-white wings.
Evening Grosbeak call types can help track groups that look nearly identical. Researchers combined community recordings with sounds from autonomous recorders in Oregon and California. The recorders sampled 20 locations over four years, yielding 1,865 hours of audio for analysis.Their call differences help track groups that are nearly identical in appearance.
During breeding, type 1 was more common in the north of the study area, while type 2 was more common in the Sierra Nevada. The types overlapped in southern Oregon. After breeding, both ranged widely and often occurred in the same areas, especially in the Sierra Nevada; type 2 was rare north of southern Oregon. Community scientists contributed 119 recordings.
An extinction-risk assessment has not been added yet.
Identifying call types in recordings helps map the distribution and seasonal movements of groups that look alike. This study documented where the types overlap during breeding and how both range more widely after breeding.