The White-necked Jacobin (Florisuga mellivora) is a striking hummingbird found in Costa Rica, recognizable by its vibrant blue breast, purplish head, and distinctive white fan tail. This species thrives in tropical forests, gardens, and edges, often seen hovering and darting around flowering plants. White-necked Jacobins are highly territorial and exhibit aggressive behavior to defend their feeding grounds. They primarily feed on nectar, using their long bills to access deep flowers, and occasionally consume small insects for protein. Known for their acrobatic flight and dazzling plumage, these hummingbirds play a crucial role in pollination, contributing to the health of their ecosystems.