Black-billed Nightengale-thrushes are common highland birds. Note the (for once appropriately named) bill, the similar ruddy-capped (coming soon to a post near you) had a bicolored bill
A Tufted Flycatcher teed up on an overhead power line as we walked out to a field where quetzals had been feeding earlier in the morning.
The Costa Rican version of Hairy Woodpecker was also very ochraceous (and with a lot less white in the wings). My understanding is that they have a continuous clinal transition, but skipping south 2000 miles made a big difference in appearance.
Each of the volcanoes in Costa Rica has Volcano Hummingbirds with a slightly different throat color. In the Talamanca highlands it's a dull lavender. When they were all split this one was called "Heliotrope-throated."
Finally a lifer, a Yellow-billed Cacique, a loose cousin to orioles but one that skulks in the underbrush
Oh and the quetzals? They might be deserving of their own post...