little blue heron, egretta caerulea, refugio de vida silvestre cano negro, wildlife and bird watching in costa rica

little blue heron egretta caerulea costa rica bird birding refugio vida silvestre cano negro birdwatching nature animal ornithology wildlife habitat fauna outdoor feather bill wild wilderness beak central america national park water wing plumage fishing green swamp wading grey exotic tropical perched conservation hunting lagoon marsh watching small genus