The reality is that almost 100% (say, 98%) of what is sold as "Red Jungle Fowl" is not pure. Even in their native habitat most (possibly ALL) Red Jungle Fowl have been contaminated with domestic chicken genetics. So...pure Red Jungle Fowl is unlikely. That being said, domesticated chickens are mostly Red Jungle Fowl. If allowed to go feral and self-select those Red Jungle Fowl traits are most likely to surface. That chick is very "wild type" in appearance but could be pure brown leghorn, Cream Legbar, really many pure breeds and crosses. A brown, striped chick could be almost anything and adult chickens with that Red Jungle Fowl look could have a lot of other breeds mixed in. If you think about dogs all breeds are 99.9% wolf but feral dogs almost always end up looking a lot like a dingo after a few generations. Are those dogs dingoes? Well...not really. There are a bunch of dominant genes that surface when given the chance and the less successful genes get eliminated fairly quickly. The birds that were "rescued" are most likely the offspring that had a lot of those dominant (selected by environment over time) genetics that allowed for maximum survival and are going to display a lot of Red Jungle Fowl traits/genetics. So...are these chicks Red Jungle Fowl? No...not pure but maybe close to the species due to environmental pressure. They might be a really good balance between domestic and wild for your area. Enjoy them for what they are but feel free to add in different breeds to emphasize traits that you might like. For example, if they don't lay enough eggs you can add brown Leghorn. If you want longer tails, add in Sumatra or Phoenix. Have fun with them but don't expect them to fit into any purebred definition.
