* Composition: Saint-Saëns was a prolific composer, writing in virtually all genres, he was particularly known for his orchestral works, including the Symphony No. 3 in C Minor, the Piano Concerto No. 2, and the Carnival of the Animals.
* Astronomy: Saint-Saëns was a keen amateur astronomer, and contributed several articles to astronomy journals. He also invented an instrument called the planisphere, which is used to find stars in the night sky.
* Literature: Saint-Saëns was a voracious reader, and had a particular interest in French literature. He was a member of the French Academy, and wrote several essays and articles on literature and music.
* Other hobbies: Saint-Saëns was also interested in photography, sailing, and painting.