- Biosecurity
- Biotechnology
- Bioética ambiental
- Birch
- Birch Tree Magic
- Bird After Bird
- Bird And Bough
- Bird and Butterfly Mysteries
- Bird and Other Nature Problems
- Bird Atlas 2007-11
- Bird Behaviour, Psychical and Physiological
- Bird Biographies
- BIRD BIOGRAPHIES. A GUIDE BOOK FOR BEGINNERS
- Bird Cloud
- Bird Detective
- Bird Ecology and Conservation
- Bird Feeding Attraction
- Bird Friends
- Bird Life at Home and Abroad - With Other Nature Observations
- Bird Life in England
- Bird Love
- Bird Migration
- Bird Neighbors
- Bird Neighbors (Illustrated)
- Bird Neighbors - An Introductory Acquaintance with One Hundred and Fifty Birds Commonly Found in the...
- Bird Neighbors: An Introductory Acquaintance With One Hundred and Fifity Birds Commonly Found In the...
- Bird on Fire
- Bird People: A Memoir
- Bird Populations
- Bird Portraits
- Bird Quest
- Bird Song ID Videos
- Bird Stories from Burroughs - Sketches of Bird Life Taken from the Works of John Burroughs
- Bird Student
- Bird Studies, in Twenty-Four Lessons
- Bird Study Book
- BIRD TALES
- Bird Trivia
- Bird versus Bulldozer
- Bird Watcher's Manual
- Bird Watching
- Bird Watching 101
- Bird Watching For Beginners
- Bird Watching for Beginners: Make You an Expert Birdwatcher
- Bird Wonders - Strangest Birds
- Bird Wonders - Strangest Birds
- Bird World
- Bird-Life
- Birder on Berry Lane
- Birders
- Birdgirl
- Birdhouses and Feeders
- Birdhouses You Can Build in a Day
- Birding Dordogne
- Birding Hot Spots of Central New Mexico
- Birding Hot Spots of Santa Fe, Taos, and Northern New Mexico
- Birding Indonesia
- Birding the Hudson Valley
- Birding the Orkney Islands
- Birding Western Ireland
- BirdNote
- Birds
- Birds & Blooms of the 50 States
- Birds - Part III - The Zoology of the Voyage of H.M.S Beagle
- Birds ...
- Birds and Bees, Sharp Eyes and Other Papers
- Birds and Bees, Sharp Eyes, and Other Papers
- Birds and Berries
- Birds and Cages
- Birds and Man
- Birds and Men
- Birds and Other Wildlife of South Central Texas
- Birds and People
- Birds And Poets - With Other Papers
- Birds and Their Young
- Birds and Us
- Birds Art Life
- Birds Art Life Death
- Birds Britannia
- Birds by Night
- Birds by the Shore
- Birds Do It, Too
- Birds Every Child Should Know
- Birds for Kids
- Birds in England
- Birds in Ireland
- Birds in London
- Birds In Nature
- Birds in Scotland
- Birds in the Ancient World from A to Z
- Birds in the Bush
- Birds in the Calendar
- Birds in the Hand
- Birds In Town and Village
- Birds in Town and Village
- Birds in Trouble
- Birds in Wales
- Birds in Wetland Holland
- Birds Make Noise
- Birds Nesting and Egg Collecting
- Birds Nesting in India - A Calendar of the Breeding Seasons, and a Popular Guide to the Habits and H...
- Birds New to Science
- Birds of a Feather
- Birds of America - Highlights
- Birds of an Iowa Dooryard
- Birds of Anahuac & High Island
- Birds of Argentina
- Birds of Argentinien
- Birds of Arizona Field Guide
- Birds of Australia
- Birds of Berkeley
- Birds of Borneo
- Birds of California Field Guide
- Birds of China
- Birds of Colorado Field Guide
- Birds of Costa Rica
- Birds of Cyprus
- Birds of Eastern North America
- Birds of Ecuador
- Birds of Essex
- Birds of Florida & Bahamas
- Birds of Florida Field Guide
- Birds of Fuente De Piedra
- Birds of Georgia Field Guide
- Birds of Greece
- Birds of Hawaii
- Birds of Houston
- Birds of Iceland
- Birds of India
- Birds of Indonesien
- Birds of Irland
- Birds of Island
- Birds of Japan