What is the Arsenal mascot?

I'm curious, what exactly is the Arsenal mascot? Is it a fierce lion, a graceful eagle, or perhaps something more unique? I've seen football clubs with all sorts of mascots, and I'm eager to learn about Arsenal's representation. Is there a story behind its choice, or is it simply a symbol that has been adopted over time? I'd love to hear more about the history and significance of this mascot in the Arsenal community.