While it can be normal for a tree to shed bark, there are certain warning signs that you should be aware of when doing tree maintenance.
Is Peeling Bark Bad?? - UF/IFAS Extension Duval County
10 Trees with Peeling or Flaking Bark
What the red bark of Manzanita does in summer — Alyse Lansing
Trees With Peeling Bark: The Best Varieties for Your Garden
What's This Tree with Split Bark and Hundreds of Round Fuzzy Brown
Shedding, Peeling, and Splitting Bark on Shade Trees
Tree Bark in Winter – Fairfax Gardening
Beautiful Bark on Deciduous Trees - FineGardening
Peeling Bark - What Does it Mean? - T&G Tree Services