no. 7 



FLOCKS OF NEOTROPICAL BIRDS — MOYNIHAN 



65 



Diagram i.— The special interspecific preferences of the most commonly 

 observed species of the blue and green tanager and honeycreeper alliance revealed 

 by predominantly "friendly" joining and following reactions. 



The species are identified by initials. RH = red-legged blue honeycreeper. 

 BD = blue dacnis. GH = green honeycreeper. BQ = bananaquit. PCT = 

 plain-colored tanager. GM = golden-masked tanager. PT = palm tanager. 

 BT = blue tanager. 



The arrows point from the species exhibiting a special interspecific preference 

 to the species that is the object of this preference. The width of the arrows is 

 roughly proportional to the apparent strength of the preferences. 



