Fontes: 
riverdaughter.wordpress.com; www.icis.com;  naturescrusaders.wordpress.com;  dailymail.co.uk; www.campbellriverwhalewatching.com/grizzly.html;  centralpark.com; einekleinenichtmusik.blogspot.com;  die-k-files.blogspot.com;  www.desktoprating.com;  commontragedies.wordpress.com; www.firstpeople.us; www.alaska-in-pictures.com; asymptotia.com

FONTE DAS IMAGENS:
freefoto.com; popgadget.net; grainoflight.wordpress.com/2008/03/; teclasap.com.br;  islampoetry.files.wordpress.com; www.natureartists.com; www.hickerphoto.com; http://disney-clipart.com; http://4.bp.blogspot.com; http://animal.discovery.com/birds/duck/
www.mbedard.com/ProdImages/; www.aboutkhai.com; http://crapsack.files.wordpress.com; birdingaltoandino.com;birds.cornell.edu/crows; www.jrcompton.com;