Hesperornis

Egg farm

Female Hesperornis can lay and when brought out of water after killing and eating 5 fish. This process can be somewhat sped up by killing fish as the player and then commanding Hesperornis to attack fish corpses in the water. Note that there is about 10 seconds delay between Hesperornis reaching the shore and laying an egg. The Golden eggs give a temporary 500% experience boost to smaller creatures such as , and or a 10% boost to larger creatures when consumed. They are also an…

Polymer

Hunting Hesperornis is a great way to obtain for people who do not have Fur Armor or who are far from the snow biome where the more numerous are found. The is the most efficient tool to harvest the polymer.

Polymer Farm

Although it is not the most popular option, the Hesperornis are easier to find than in the early game, so it would be a good alternative to tame a pair in order to start the breeding project to eventually make a good farm.

Fisher

The Hesperornis will insta-kill any small fish (e.g. coelacanth, sabertooth salmon, etc...). This makes it an excellent fisher.