The image of the Keel-billed Toucans (Ramphastos sulfuratus) appears on every curio in Costa Rica. It is a spectacularly beautiful bird, and is very common. Their call is heard everywhere.
Here's an example of a Keel-billed Toucan's (Ramphastos sulfuratus) "whisper song" recorded at El Pizote, near Puerto Viejo de Talamanca (Costa Rica), 6/21/99.