And Tango Makes Three by Justin Richardson and Peter Parnell. Illustrated by Henry Cole. unpgd. Simon & Schuster Books for Young Readers, April, 2005. 9780689878459.

#tbt features a picture book that has been at or near the top of every "Most Frequently Challenged" list since its publication in 2005. It is the true story of Roy and Silo, two male chin strap penguins who resided at the Central Park Zoo. They were a bonded pair and their keeper would notice that they would attempt to hatch stones. When he found an abandoned egg, he gave it to them to hatch. The two tended the egg and its hatchling, who was named Tango. This lovely story about what makes a family was written by  Justin Richardson and Peter Parnell and illustrated by Henry Cole.