Large animals typically have thick, tough skin, since they are heavy and there is a lot of stress placed on that skin by the weight of the flesh that it contains. In addition, tough skin protects against various potential dangers such as scratchy thorns, bites, etc.
Its muscle, tough skin, and horn
Very tough, leathery skin.
Yes, they are fat creatures, but their skin is tough in some places because of the sun and the elements.
Life. Love. Rhinos. Lions. Tigers. Bears.
Rhinos are grey with wrinkly skin and a big horn.
The skin can make carpets
The stratum corneum is the tough outer layer of the skin.
When they are in the cold water, the thick skin heats them up.
You could say The apple's skin was rather tough. The apple skin was rather tough is even better.
Yes! Tough but smooth
A tough waterproof skin.
This is a possessive - "The skin of the apple" so it goes "The apple's skin was rather tough" If there's more than one apple you'd say "The apples' skins were rather tough"