Why are there SO MANY Salamanders in Appalachia?

Reflecting on my recent trip into the heart of the Appalachians, I started to wonder why there are more salamanders here than anywhere else in the world Buy the NEW MARS MAP here: https://store.nebula.tv/products/atla... Find my EXTINCT BUTTERFLY POSTER here: https://store.nebula.tv/products/atla... Follow me on twitter/x @theatlaspro Sources / further reading https://biodiversitymapping.org/index... https://www.jstor.org/stable/1443655 https://www.smithsonianmag.com/smiths... https://www.oriannesociety.org/scienc... https://www.ncarboretum.org/event/sal... https://enst250.wordpress.com/how-the... https://www.ncwildlife.org/Portals/0/... https://herpsofnc.org/red-salamander/ https://digital.tnconservationist.org... https://highlandsbiological.org/biodi... https://tnaqua.org/riverwatch/why-is-... https://eeb.utk.edu/studying-salamand... https://www.flickr.com/photos/briangr... https://news.mongabay.com/2018/12/ess... https://www.srs.fs.usda.gov/pubs/ja/j... https://www.fs.usda.gov/research/tree... https://www.researchgate.net/figure/M... https://salamandersofchina.myspecies.... https://www.zsl.org/news-and-events/n... https://academic.oup.com/evolinnean/a... https://www.researchgate.net/figure/S...