This boys are the best carriers to farm resources in mid game.
You can put a magmasaur in a criopod, take it to a local with lots of metal/cristal/obsidian, collect everything you want. Then, drop all the resources in a bag, aim at the bag with the hawk in your shoulder, press double F to throw it in the bag and quickly ride your flyer and go to your base. The hawk will follow you with all the resources in the bag.
Just remember the flyer must be faster than the hawk, otherwise it will reach you and drop the bag.
Your loot is safe ish with one of these, if you die your Hawk will teleport to your spawn location and will drop your death cache next to you, they also allow you to see dino's HP and other death caches around you. Very useful if your on console without mods.
Not only does it retrieve your items if you die (everything - IF it can handle the weight!) but it can fetch bags for you!! On Xbox, double tap Y with the bag in your line of sight and Fjordhawk will retrieve it for you. It will highlight bags with a little icon of a skull and crossbones in a black circle that pulses. Hope that helps. Thanks !!