 Mating occurs at any time of the year , although it does have seasonal peaks between February and June in the humid uplands during the rainy season . When mature males meet in the mating season , they face each other in a ritualised dominance display , rise up on their legs , and stretch up their necks with their mouths gaping open . Occasionally , head @-@ biting occurs , but usually the shorter tortoise backs off , conceding mating rights to the victor . The behaviour is most pronounced in saddleback subspecies , which are more aggressive and have longer necks . 
