These Black-chested Jays (Cyanocorax affinis) announced themselves at the El Pizote lodge (one of my favorite spots), near Puerto Viejo de Talamanca (Costa Rica), 6/23/99.
Brown Jays (Cyanocorax morio) are very common residents of both slopes. They hate quiet and will do whatever they can to destroy it when they find it! You'll also hear the call of Blue-crowned Motmot in this recording. (Costa Rica)