Thatch is one of the most common resources in Ark. Yuo can harvest it by hand, pick, axe, or dino, this resource is used in crafting many items. Thatch can also be burned as a fuel in most fires. With the right Dino, you can harvest vast amounts of Thatch very quickly. Large quantities of Thatch are often used in Stone construction.
Thatch is easy to harvest. You can harvest it by hand simply by hitting any tree. Be warned, though, you will injure yourself if you use this method. A pick is the best handheld tool for harvesting Thatch. An axe does yield some thatch, but not very much. Metal tools are far more effective and yield much higher quantities.
Most Dinos do collect some Thatch in addition to small amounts of wood. The best early game harvester of Thatch is the Trike or Triceratops. With the huge head on this Dino you can quickly get large quantites of Thatch, along with a lot of berries and seeds, and small amounts of wood.
Probably the best Dino for harvesting Thatch is the Bronto or Brontosaurus. With its massive tail, the Bronto can bring in tons of Thatch, berries, and seeds in a very short time. Be careful, however, as that tail can do a lot of damage and easily strike nearby Dinos.