
Cloud forests, cacophony, colour.
These are species with at least one recorded territory in Costa Rica, not a national checklist: a bird list from eBird or Avibase is more complete. The counts follow recording effort as much as wildlife, so a country with more visitors and more naturalists will show more of both.
The species with the most open occurrence records in Costa Rica, among those a photograph exists for. Most recorded is not most numerous: it rewards animals that are common, conspicuous and live where people go.

Turdus grayi

Pitangus sulphuratus

Thraupis episcopus

Amazilia tzacatl

Tyrannus melancholicus

Ramphocelus passerinii

Coragyps atratus

Myiozetetes similis

Psarocolius montezuma

Melanerpes hoffmannii

Quiscalus mexicanus

Ramphastos ambiguus

Tapirus bairdii
Ancient forest engineer; patience is the only technique.

Morpho helenor
Electric blue flashes down forest paths, impossible to photograph in flight.

Iguana iguana
Basking in the crowns of trees along slow rivers.

Panthera onca
Tracks along the beach at Corcovado; the animal itself is a gift.

Ramphastos sulfuratus
Improbable bill, croaking calls above the canopy.

Panthera pardus
Cryptic, solitary, and everywhere, if you know where to look.

Alouatta palliata
The sound of the neotropics at first light.

Agalychnis callidryas
Night walks after rain, leaves at eye level.

Pharomachrus mocinno
The green-and-scarlet emblem of the cloud forest, tail streaming behind.

Ara macao
Pairs streaking above the beach almond trees at Carara.

Oophaga pumilio
Tiny, loud, and unmistakably red on the forest floor.

Bradypus variegatus
Slow-motion cecropia specialists: look up, then look up again.

Cebus imitator
Clever, curious troops. Do not feed them, ever.