l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 143 



Tables 3 to 6 are counts of special reactions within the mixed flocks 

 in and around the clearing on Barro Colorado Island. 



Table 3 is a partial list of interspecific following reactions observed 

 between October 26 and December 20. For the purposes of this table, 

 only flying reactions were counted, when a bird of one species flew 

 after a bird of another species. In some cases, the two birds flew from 

 one tree to another ; in other cases, from one branch to another within 

 the same tree. Only rapid reactions were counted, when one bird 

 flew after another within 30 seconds after the first bird flew. Only 



Table 3. — Data jrom observations in and around the clearing on Barro Colorado 

 Island between October 26 and December 20, 7959 



Unambiguous interspecific following reactions by tanagers, honeycreepers, and 

 warblers. (Interspecific following reactions by finches are omitted from this 

 table because all such reactions observed during this period were ambiguous in 

 one way or another.) 



No. of 



cases seen Species following Species being followed 



15 Palm tanager Plain-colored tanager 



2 do. Blue tanager 



4 Blue tanager Plain-colored tanager 



1 do. Palm tanager 



2 Golden-masked tanager Plain-colored tanager 



1 do. Blue tanager 



3 Green honeycreeper Plain-colored tanager 



1 Summer tanager Plain-colored tanager 



1 do. Palm tanager 



2 Fulvous-vented euphonia Plain-colored tanager 



1 Bananaquit Green honeycreeper 



1 Chestnut-sided warbler Golden-masked tanager 



34 



those reactions are shown in which the following bird was a tanager, 

 honeycreeper, or warbler (of any species — not only the ones included 

 in tables 1 and 2). 



Table 3 is also a partial list because it includes only the following 

 reactions which were seen quite clearly and could not be misinter- 

 preted, i.e., when it was possible to identify both the followed bird and 

 the follower with absolute certainty. Many following reactions are 

 omitted from this table because they were ambiguous in one way or 

 another. Thus, for instance, none of the cases in which a bird of one 

 species followed a group of two or more species is included in the 

 table, as it was impossible to determine exactly which particular species 

 was being followed in such cases. Similarly, cases in which two or 



