Signals
In spite of being so massive, they could hardly be in any trouble but in a situation like this, they had to call out for help. So when they had no other option they cried out for help. Their roar wasn’t the one that could be ignored the people in the vicinity, at first they couldn’t understand and was afraid of the sudden uproar from the wild. Would they be able to get the signal the herd was trying to give?
