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Myioborus torquatus
is a tropical New World warbler endemic to the mountains of Costa Rica and western Panama. Like other members of Myioborus, it is often called a "whitestart" rather than a "redstart". The Collared Redstart feeds on insects, frequently fanning its striking tail as it pursues its prey.
The Collared Redstart is common at heights between 1500 m and the timberline in mossy mountain forests, ravines, second growth, and adjacent pastures.
Thanks everybody, I learnd this is an endemic specie from Costa Rica and Panamá, didn´t know that.