The Sky Elf: The Violet-Green Swallow – Nature in Novato
Cliff Swallow Identification, All About Birds, Cornell Lab of Ornithology
Amazon.com : Boosigant Binoculars for Kids 8x21, Gift for 3-12 Years Boys & Girls, Compact Kids Binoculars High-Resolution Shockproof Mini Binoculars for Bird Watching, Hiking, Camping, Travel Blue 302 : Electronics