Observation procedure
Whenever I observed a bird fly into a fruiting tree, I noted the species and its time of arrival. I then watched the bird to see if it fed, and when possible noted when it left the tree or when I noticed the bird was no longer present. I did not generally note how many fruits a bird ate in one visit. Each observation only notes the presence of a bird and whether it fed or was not observed doing so during that visit. Each bird arrival was counted separately as one observation.
T his methodology led to understatement of the actual number of fruits consumed by some of the species. The best example of this can be seen by looking at my records of Fiery-billed Aracari (Pteroglossus frantzii ) feeding in Willy’s Huevos de Caballo . Although my original records noted it only fed one time in that tree and was in the tree from 7:58-8:01 AM, a video I took of that bird showed that it grabbed 18 “fruits” (arils) one at a time in that time-span. Some other large birds also ate numerous fruits in one visit, while most smaller birds, which were generally in a tree for shorter periods, usually only grabbed one fruit at a time. Given the variability, it is clear there were more actual feedings than my tables show.
I constructed two tables (Appendices 1and 2, which can be found at https://doi.org/10.5061/dryad.n5tb2rc0q) which included all my visits to each tree, and showed the total number of visits by each species, its arrival and departure times (if noted), and whether or not it fed.