Abstract
Interactions between species can be beneficial to one or both species and such interactions may be facilitated by recognition of group members. Splendid and variegated fairy-wrens often share overlapping, co-defended territories. We show for the first time that these species discriminate among heterospecific individuals. Long-term heterospecific associations are likely more widespread than previously appreciated, and recognition may play a significant role in the maintenance and coordination of mixed-species assemblages.
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