A lot of the tropical birds can be found in mixed feeding flocks, find a flock, find the birds. The dominant species in the high-oak forest in the mixed flocks were Ruddy Treerunners and the surprisingly difficult to photograph Black-cheeked Warbler
Other birds were more soliatary (like an aptly named Black-faced Solitaire). The Solitaire's song is well worth pulling up in xeno-cantu, it sings a series of harmonics somewhat on the pitch of the climactic note of a Hermit Thrush song
Butterflies were coming out as we were on our way down, Gulf Fritillaries were pretty common
I'm not quite sure what this one is though.