The Fork-tailed Flycatcher (Tyrannus savanna), which is a member of the kingbird genus Tyrannus, often perches prominently on the top of fence posts or shrubs; from such conspicuous perches, the flycatcher sallies after insects or hover-gleans to feed on fruit.

Is a distinctive inhabitant of grassland and open terrain from southern Mexico south to Argentina. Fork-tailed Flycatcher is mostly black and gray above with white underparts, and, as the name implies, has an extremely long forked tail. The southernmost populations are migratory while populations in southern Mexico are resident.

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References:

Jahn, A.E., and D.T. Tuero. 2013. Fork-tailed Flycatcher (Tyrannus savana), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=482636