Very little is known about adult Graboid society. They clearly communicate, at least to signal one another about food sources. And they cooperate (to dig the bulldozer trap in T-1). El Blanco has been recorded making a wide variety of clicking noises, and will rap his beak against rocks to make a hollow drumming sound, but no one knows what this means. Thus far Graboids have not been observed fighting. Since they do not mate, it is unlikely that they have any conflict over mating. But so much of what they do is hidden underground, who is to say at this point?
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