It looks like a baby seedling. I think one of your mature Venus Flytraps flowered and was pollinated, so it made seed, then a seed fell into the soil and sprouted. Baby plants have mini traps. Another possibility (and maybe more likely) is it's a baby plant that came up from an underground rhizome.

Hi - You came to the right place! 1. Your plant may not go dormant this winter. Don't worry about it. 2. Keep it very wet and use distilled water or rain water only. Do not use spring or tap water. The plants can't handle the minerals. 3. Very bright light is optimal. Just make sure it isn't going to get real hot where you put it. 4. Do not put it in a terrarium, make sure it has air flow around it. 5. You don't need to feed it. They can survive a long time without bugs and it is probably stressed right now and the trap would just die anyway. It will catch bugs on its own in the Spring. These plants grow in bogs, which means they stay very wet, have plenty of fresh air and full sun (trees can't grow in bogs). Since you're in Colorado, a south facing window would work fine... lots of sun! Have fun!

No more than 3 inches away for fluorescents. Don't keep it waterlogged under lights either. Once temps stay above 50 it can go outside in full sun and you can increase the water level. RO water is ok also.

Those are little babies. My most prolific Venuse fly trap is one that came in a kit from Walmart. It has made dozens of divisions over the many years that I have had it. The pitcher plant and venus fly trap need sunshine, rain water or bottled pure water not tap water and a dormant time to rest in the winter. If you do not have hard freezes, they can stay outdoors all winter. The potting soil that works best for me is a half peat/half perlite mix that I get very soggy with rain water. The venus fly traps i put in a pot with a drain hole and then place in a bowl with water up to half way up the pot. The pitcher plant can have water higher. It is fun to have the carniverous plants close by to watch them. I give a lot of carniverous plants away to kids, but only after they can pass a test for caring for them. I hope that your plants are still alive.