I never liked my own species. On why so many of his comics are about animals, in an interview.

Cartooning was a good fit for me. And yet now, years later, I almost never think about it.

I think I'm maintaining the quality, but internally I'm paying for it.

Humans have changed ecosystems more rapidly and extensively than in any comparable period of time in human history, largely to meet rapidly growing demands for food, fresh water, timber, fiber and fuel. This has resulted in a substantial and largely irreversible loss in the diversity of life on Earth.

People try to look for deep meanings in my work. I want to say, 'They're just cartoons, folks. You laugh or you don't.' Gee, I sound shallow. But I don't react to current events or other stimuli. I don't read or watch TV to get ideas. My work is basically sitting down at the drawing table and getting silly.

Great moments in science: Einstein discovers that time is actually money.

I think one thing that's important to maintain is a sense of fear, always doubting yourself... a good dose of insecurity helps your work in some ways.