While they only weigh 7.1 ounces as babies, giant otters can grow to six-feet-long and weigh up to 71 pounds. Chester Zoo Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. It turns out that giant otter ( Pteronura brasiliensis ) newborns are actually quite small, weighing just around 7.1 ounces. “[That’s] about the same as a decent-sized chocolate bar,” Frazer Walsh, a carnivore keeper at Chester Zoo outside of Liverpool, England, tells Popular Science .  The zoo has just welcomed three of their own decent-sized chocolate bars, the offspring of mother Bonita and father Manu. The three siblings haven’t received names yet. Before the birth, the zoo’s staff cordoned off the giant otter habitat before their birth, and kept a non-invasive eye on the soon-to-be family using cameras.…