The best time to visit Caño Negro Wildlife Refuge in Costa Rica is from December to April. During this period, the dry season is in full swing, making it easier to explore the refuge's diverse ecosystems and spot various wildlife species. The dry season offers better visibility for wildlife viewing and hiking along the network of trails within the refuge. It is an ideal time to witness the amazing spectacle of migratory birds that flock to Caño Negro. Birdwatchers will be thrilled to observe vibrant species such as herons, egrets, spoonbills, and ibises. Additionally, the dry season brings lower water levels, which concentrate animals near the remaining water sources. As a result, visitors have a higher chance of encountering caimans, turtles, and various fish species, as well as mammals such as monkeys, sloths, and anteaters. December to April is the dry season, when the water levels are lower and the birds are more active. This is the best time to see migratory birds, such as the roseate spoonbill, jabiru stork, Oriols, and Warblers. Also it is the best time of the year to spot a lot of caimans, turtles, iguanas and basilisks. May to November is the rainy season, but not so strong as you can find on the mountain side of Costa Rica. During this time of the year, the water levels are higher and the vegetation is more lush. This is a good time to see resident birds, such as the eagrets and herons, trogons, resident wrens, woodpeckers and the resident Black-collared hawk. If you are planning to go birdwatching, the dry season is the best time to visit. However, if you are interested in seeing the rainforest in its full glory, the rainy season is also a great time to visit. Ultimately, the best time to visit Caño Negro Wildlife Refuge is a matter of personal preference. Consider what you are hoping to see and do, and choose the time of year that best suits your interests.