Table 25. Summary of mean group sizes for birds in STEX. n = number of groups sighted. 



Species 



August November 



Cory's shearwater 17.4 9 



Audubon's shearwater 1.0 2 



Unidentified shearwater 1.2 6 



Storm-petrel 0.0 



Tropicbird 1.0 1 



Brown pelican 0.0 



Masked booby 1.5 2 



Brown booby 1.0 1 



Northern gannet 1.0 3 



Cormorant 0.0 



Phalarope 1.0 2 



Herring gull 0.0 



Laughing gull 1.0 5 



Unidentified gull 53.5 2 



Royal tern 9.4 14 



Unidentified pale tern 4.0 18 



Sooty tern 2.0 3 



Bridled tern 1.0 1 



Black tern 38.9 12 



Unidentified dark tern 1.5 13 



Unidentified tern 7.6 20 



52 



