Small and elusive
Welcome to the neo tropics!!! Many not to say the good majority of Costa Rican birds are small, elusive and fast moving. As the case of the smaller kingfisher in the Americas. Many of such birds live in rather dark forest environments so getting them captured through your lenses requires a bit more work than usual but also a certain type of lenses due the closeness they may appear to you. Is very important to choose the right camera gear for the destination, location, national park, etc. Double check your lens minimum focus distance.
This image was captured at Tarcoles River mangrove boat tour at the focal distance of 2-3 meters, a task impossible with a 500-600 prime.
Lesson to be learn
Biggest is not always the best so having a spare lens such as 200-500 nikkor or 200-400 Canon/Sony or others is a must!!! Trying having a tripod in a narrow trail full of tree roots can be frustrating. Therefore, we suggest using a monopod with little tripod-like legs.
https://www.feisol.net/monopods/feisol-monopod-cm-1473-rapid.html