White-necked Jacobin. Costa Rica enjoys a diverse range of beautiful hummingbirds. Perhaps the most spectacular is the White-necked Jacobin. Its royal blue head is a notable feature. In wet lowland and the foot hills of Costa Rica, these birds are reasonably common. The ever present thrumming of their wings that you can hear is because I was surrounded by lots of these birds and they seemed fascinated by the microphone on my camera. Fantastic encounter!