SpongeBob is a type of sea sponge.
In SpongeBob SquarePants, the main character is a sea sponge.
The series' creator, Stephen Hillenburg, was a marine science teacher and thought that the sponge was a fascinating and underrepresented animal.
Patrick and SpongeBob are not anatomically correct starfish and sponges.
While the real-life sponge is as yellow as the Nickelodeon character, SpongeBob's shape is far from what's found in nature.
"SpongeBob is obviously shaped like a plastic cleaning sponge — he's rectangular,".