Should be Coccycua minuta. Another candidate would be Piaya cayana with more contrasting and less sharp colors than Minuta. But: looking at the eye, Cayana should have some brighter parts, like a kind of yellow ring around the eye, which yours does not show and Minuta has a complete red eye, like yours. That's why I am tending to Coccycua minuta. But I must admit it is tricky to separate by superficial view. I also think that yours might be smaller than Cayana, which would fit with Minuta as well. Maybe other can help us with confirming.
Cayana:
http://en.m.wikipedia.org/wiki/Squirrel_cuckoo
https://www.flickr.com/photos/dominikhofer/4180089272/
http://www.discoverlife.org/mp/20q?search=Piaya+cayana
Minuta:
http://avibase.bsc-eoc.org/species.jsp?avibaseid=07DD8007BC9EA1DA
http://en.m.wikipedia.org/wiki/Little_cuckoo
http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=201336
http://www.birdlife.org/datazone/speciesfactsheet.php?id=1314
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