The poison arrow frogs sit in the enclosure at the S.E.A Aquarium at Resorts World Sentosa on March 2, 2017 in Singapore. Measuring 1.5 to 6 centimetres, the deadly species secrete toxins through their skins that are powerful enough to kill an adult. The thumb-sized frogs are the first amphibian to be showcased in S.E.A Aquarium as part of its long term animal collection plan to exhibit new and unique species for conservation awareness on the diversity of marine life. (Photo by Suhaimi Abdullah/Getty Images)
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