I have forgot to present you a very nice bird but hard to observe :
The Squirrel Cuckoo (Piaya Cayana, in french Piaye Ecureuil)
He is not visible every day, we just see him one time a week, or less. This bird is remarquable by his long and beautiful tail who can open up like a fan.
Above all, this bird deserve his name due to his moving style in the trees. Unlike others birds who fly from branches to branches, this cuckoo jump along trunks and foliages with very quick jumps (as a squirrel) ! His long tail is of course helpful him do find a balance.
This Squirrel Cuckoo area of repartition cover all south America. He nests in forest edges looking to hunt his favorite insects : caterpillars !
Sources :
http://www.gepog.org/Phototh%C3%A8que/Cuculid%C3%A9s/Piaya-cayana