Chitin drops from insects and arthropods in ARK: Survival Ascended. It's used for crafting Cementing Paste, saddles, and armor.
Node yields assume the base harvest HP from game data (e.g. 1000 for Redwood trees, 620 for Metal nodes). In-game, trees and rocks with bAllowHarvestHealthScalinghave per-instance HP that varies with the node's size, so actual yields per node will vary. The values shown represent the average.
The Diplocaulus is the best Chitin farmer with a 32.5x gather multiplier from game data. The Megachelon is the runner-up with 6x.