Learning library
Learn one species.Understand an island.
Families, habitats, seasons, conservation, and culture connected to 402 profiles and the sources behind the atlas.
A library built around questions.
A checklist answers which birds have been documented. Understanding them also requires island evolution, habitat, movement, breeding, threats, recovery, and the names people use to recognize them.
These guides bring those relationships together without hiding uncertainty. Every important claim can continue to a species, a thematic collection, or a primary source.
Choose a scale
From one bird to an archipelago.
Knowledge pathways
Read by topic. Follow the evidence.
Pillars exploring the natural and cultural identity of Puerto Rico birds.
All guides →Essential guide
Endemic birds
An updated guide to Puerto Rico's 19 endemic birds, with names, habitats, sounds, places to look, and links to every species profile.Taxonomy, explained
17, 18, or 19?
Why credible sources publish 17, 18, or 19 Puerto Rico endemics, and how the Puerto Rican Mango and Euphonia changes altered the list.Identification guide
Hummingbirds
Identify Puerto Rico's five resident hummingbirds by size, bill, throat, crest, habitat, and distribution, with profiles and sounds.Seasonal guide
Migratory birds
Guide to Puerto Rico migratory birds by group, habitat, and season: warblers, shorebirds, ducks, raptors, and rare visitors.Field language
Puerto Rican names
Learn the birds behind San Pedrito, Pitirre, Chango, Juí, Iguaca, Reina Mora, and Comeñame.Coastal habitat
Mangrove birds
Explore birds of mangroves, lagoons, and channels, from herons to warblers and kingfishers.Mogotes and caves
Birds of the karst
Learn how humid and dry karst supports forests, caves, and endemic birds.Living agroforestry
Birds of shade coffee
Explore how shade coffee connects forest, agriculture, and resident or migratory birds.Natural calendar
When to watch birds
Compare migration, breeding, rain, heat, and activity to choose birding dates.Nests without disturbance
Nesting calendar
Understand when and how forest, coastal, wetland, and urban birds nest without approaching nests.Conservation in action
Recovery of Iguaca
Understand how breeding, releases, nest management, and three wild populations support recovery.Endemic coastal species
Conserving the Yellow-shouldered Blackbird
Learn the habitat, threats, identification, and recovery of the Yellow-shouldered Blackbird.Endemic montane forest bird
Conserving Elfin-woods Warbler
Explore range, critical habitat, threats, and responsible viewing of this endemic warbler.Voices, sayings, and memory
Birds in Puerto Rican culture
Explore Iguaca, Pitirre, San Pedrito, Reina Mora, Comeñame, and other birds as vocabulary and symbols.Disturbance and resilience
Hurricanes and birds
Understand how wind, food loss, movement, and recovery alter birds and observations after a hurricane.Complete trip planner
Plan your birding trip
Choose dates, regions, habitats, transport, gear, and ethical routes for a birding trip.Practical eastern route
Puerto Rico in three days
A three-day route through Piñones, El Yunque, and Humacao with manageable travel and alternatives.Endemics and habitats route
Puerto Rico in seven days
Connect El Yunque, Río Abajo, Maricao, Guánica, Cabo Rojo, and wetlands in one week.Evidence before excitement
How to document a rare bird
Take useful notes, photographs, and audio without harassing the bird or revealing sensitive sites.The lost atlas
Extinct and prehistoric birds
Separate historical extinctions, species known from fossils or subfossils, and accidental records.Essential stories
Four doors into the atlas.
Endemism, migration, conservation, and adaptation become concrete in each profile.
Libraries within the atlas
Group birds to understand relationships.
Living Endemic Birds
The extant endemic birds that make Puerto Rico one of the Caribbean's most distinctive birding destinations.
Migrants & Vagrants
Passage migrants, winter visitors, seasonal movers, offshore visitors and rare vagrants recorded from Puerto Rico.
Globally Threatened Birds
Birds classified as Critically Endangered, Endangered or Vulnerable in the reconciled IUCN data.