Southeastern Caribbean Bird Alert Southeastern Caribbean Bird Alert - No. If you are a visiting birder and have benefitted from this service, please let us know what you've seen. Only females are known to incubate in this and all other species of manakins. Although the androgynous acquisition of reddish feathering on the head of females seems unusual, it has been reported previously for this and several other species of manakins. In Argentina, clutch size of the Chalk-browed Mockingbird was 3.0 in temperate Buenos Aires and 2.9 in subtropical Formosa.
Clutch size is surprisingly high for mockingbirds in highly seasonal tropical localities.
In southwestern Ecuador, clutch size of the Long-tailed Mockingbird averaged 3.9. Clutch size of the Galapagos Mockingbird in the Galapagos Islands also averaged 3.9. The mean clutch size of 2.9 for the Tropical Mockingbird in Trinidad is the lowest reported for any species of mockingbird. Many of the identifications reported in the SCBA are tentative in nature. Over 130 records have been submitted thus far.