Ian Falconer, a wide-ranging artist best known for his picture books about the adventures and antics of Olivia, a bossy, brassy piglet who charmed her way into bestsellerdom, becoming one of the most popular characters in modern children’s literature, died March 7 at a hospital in Norwalk, Connecticut. He was 63.

The cause was kidney failure, said his lawyer and agent, Conrad M. Rippy.