The Mato de agua or Blue Tegu is one of the most typical reptiles you see in Venezuela and other South American countries. I saw them a zillion times while playing outside as a child.
Males court females by making funny movements with their heads, by hissing and carefully biting the females on their tails. If females find them OK, they node and raise those tails.
Females can have from 4 up to 32 eggs (do you see the pattern? 4, +-8, +-12, +-32, cool, ins't it?)
Matos de agua can be up to 1.4 metres long.