I think? it's a brown tersa sphinx moth caterpillar. They go underground to make their pupa, and, by the dark color of its head, that might be what it wants to do. Their natural host plant is buttonweed, but they commonly use pentas in people's gardens. Here's an old picture of a brown one and a green one - Sherry

Yep that's it! Allen P. McConnell! Thanks ademink! It has never been moved - it looks like HVX? I don't know anything about that so I'll have to do some research on this forum about it. Thanks for the warning.

It's funny you ask as there is NOTHING around this little one. The closest hosta is a good 40 feet away! Right now I call it baby hosta. lol. I'm very attached to it. I don't know anything about seedlings but I think I may need to research some info on them. Theresa, lol...I'm glad I'm not the only one. Some of my hostas are male and some are female. I don't discriminate ;) I do think most are "male" though and think the reason behind it is that I am a mother to 3 boys, 4 if you include my husband! I guess since I'm a mother to these plants, it automatically makes them boys since that's all I've ever been a mother to! June...she is definitely female and so is Miss Frances Williams. I think their names determined their gender though...not me!

Definitely a Mammillaria. These darn Mammillaria can be so hard to id sometimes:). I think it looks more like a Mammillaria boscana, just without the hooked spines. Take a look at Mammillaria albicoma;).