20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I43 



when it flew (or hopped, in a few cases) within 10 feet of the other 

 (the other bird being perched at the time) without obviously forcing 

 the other bird to leave. Only those interspecific joining reactions are 

 shown in which the joining bird was a tanager or honeycreeper of any 

 species. As in the case of the following reactions, only those joining 

 reactions are shown which were completely clear and unambiguous. 

 Thus, interspecific joining reactions were also actually much more 

 common than indicated in the table. 



This table was compiled by adding together all the suitable cases of 



Table 5. — Data from observations in and around the clearing on Barro Colorado 

 Island between November 10 and December 20, 1939 



Unambiguous interspecific following and joining reactions by tanagers, honey- 

 creepers, and warblers. This is a different summary of the data shown in 

 table 4. (Interspecific following and joining reactions by birds other than tana- 

 gers, honeycreepers, and warblers are not included among the cases of being 

 followed and/or joined.) 



No. of times seen following No. of times seen being 



Species and/or joining followed and/or joined 



Plain-colored tanager 5 33 



Palm tanager 25 6 



Blue tanager 8 4 



Golden-masked tanager 5 * 



Green honeycreeper 4 3 



Red-legged blue honeycreeper 1 3 



Crimson-backed tanager o 2 



Summer tanager 2 



Fulvous-vented euphonia 2 



Bananaquit 1 1 



Chestnut-sided warbler 1 1 



interspecific following and interspecific joining seen during the period 

 between November 10 and December 20, 3 and it is set up in the same 

 way as table 3. 



Table 5 is a different type of partial summary of the same inter- 

 specific following and joining reactions shown in table 4. In table 5, 

 the number of times each species was seen to follow or join and the 

 number of times it was seen to be followed or joined are summarized 

 separately, without indicating the other species involved in each case. 



None of the interspecific following or joining reactions included 

 in the preceding tables were accompanied by overt indications of 



3 Recording of interspecific joining reactions was not begun until Novem- 

 ber 10. This is the reason why earlier cases of interspecific following have 

 been omitted from the summaries in tables 4 and 5. 



