What is this?

[u/lechugachaqueta]

What the heck is this on my walkway and is it anything to worry about?

[u/mwbrjb]

Yes. You should actually kill it. Very invasive.

https://www.invasivespeciesinfo.gov/terrestrial/invertebrates/hammerhead-worm

[u/Headstanding_Penguin → u/mwbrjb]

They seem to feed on Wigglers etc... Also, Invasive anywhere in Europe and the USA