Dinosaurs can form herds or packs. To create a group, press tab twice and press the button to make a group. By doing this, you become the alpha of that group. Pressing the arrow next to a name allows you to invite them to your group. Carnivores can only invite members of their species to their group, while herbivores can invite other herbivorous species.
Carnivores of the same species will lose comfort if they are not in a group.
One can challenge another member of the group to increase their standing. If the alpha dies, the next highest person becomes the alpha.