User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-6050823-20130206223334/@comment-74.177.199.135-20130210235119

From them signaling each other,they must have good hearing if their planning attacks since their nearly blind.It also seems with that new dig attack,they use it to gather prey into a tight circle and,than they both combine their tornados to kill their prey(If they can swim in water than they could do it with fish).Anyway your most likely right about them being mating pair,plus from them being in the Towers I assume,they gather in the Towers during mating season,and pair up with each other.Also these Lavasioths could explain why Plesioths aren't found in the Great Forest(Plesioths could be found in this area,but not in-game or just in MHFO).