I counted up how many times each enemy appears in SMB1

[MetaWeegee]

If you've ever woken up at night and wondered this, well your sleep demon is gonna be happy to see this video. A full list in reverse order from least to common. The result may not be what you think.

Here's a full document that's more in depth.

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[Fizzle]

Surprising that the Piranha Plant appears in 56% of levels, even though it's the second type you encounter. To be honest, I always thought Goombas were more populous, but Piranha Plants appear in nearly every single pipe, so it makes more sense now.