Namibia has invited offers for at least 170 elephants in the latest response by southern African nations to the increase in the animals’ numbers, which they say they are prevented from keeping in check by international pressure. Bloomberg reports that while the number of African elephants has dwindled in recent decades due to poaching in east and central Africa, their populations are surging in southern Africa, crowding out other animals and causing them to stray onto farming land. Offers for the Namibian elephants, which will be sold in family groups, must be made by Jan. 29 and successful bidders will need to cover the cost of capturing and transporting the animals, which can weigh up to six tons.