Make sure you are not opening a duplicate.

• I have searched the issue tracker and did not find an issue describing my bug.

Description of your suggestion.

Mobs should drop Hide

naturalist:alligator
naturalist:hippo
naturalist:lion
naturalist:zebra
naturalist:giraffe

Items should be crafted to Hide

naturalist:bear_fur
environmentz:polar_bear_fur
environmentz:wolf_pelt

Can't find the loot tables of those mobs in naturalist repo or jar.