Great site, I enjoyed cruising through all the pictures. I live in Fort Collins, Colorado and have captured several of these orange and black (ant mimic?) spiders. They are very fast and I feed them small grasshoppers. They are a little bigger than a nickel or so. If you can tell me anything about them as well as what they actually are I would greatly appreciate it. A picture of one of them is attached. thank you,
David Huntwork

Hi David, It appears to be a member of the genus Linyphia. These are Sheet-Web weavers and several species are colored like your specimen, though the coloration is variable. Linyphia insignis resembles your spider most in shape.

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