Nancy F. Castaldo has been writing about the planet for over 20 years. She s contributed to the Sierra Club Waste Paper, NRDC s Personal Action column, and others. She is the author of many STEM books including, Sniffer Dogs: How Dogs (and Their Noses) Save the World, Back from The Brink: Saving Animals From Extinction, and Beastly Brains: Exploring How Animals Think, Talk, and Feel. She lives in New York s Hudson Valley. Visit her at nancycastaldo.com, on Twitter @NCastaldoAuthor, and on Instagram @naturespeak.