The Giant huntsman spider is huge, but not deadly to humans. Biggest in the world, the Giant Huntsman Spider was just recently discovered in 2001 in a Cave in Laos.
Because of reduced competition from other trees, it tends to thrive in barren soil containing too much sand, gravel, or clay. Growth and development of young trees is rapid, and their longevity can extend to 50-100 years. Siberian Elm is resistant to Dutch Elm disease, which is often fatal to other elms. It is prone to storm damage from wind, snow, and ice (especially the latter), causing breakage of branches and twigs that can litter the ground underneath the tree.
I live in a 3 zone (can get down to -30F). These trees are amazing you can shape them into anything. Left on their own the Chinese elm is probably a prettier tree...but you can trim the siberian into absolutely anything you want so that advantage is moot I like horizontal branch layers. See no downside to them.