New panda mom doesn't know she has twins thanks to these sneaky zookeepers

Crafty zookeepers are keeping a set of newborn panda twins alive by switching them out every day. 
Although twins aren't uncommon, when pandas have multiple babies they tend to devote all of their attention to only one of their cubs, leaving the other to starve. 
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But these zookeepers have managed to get new panda moms to care for both babies by rotating them out, tricking the pandas into believing they