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Spotted in the canal and escorted by police boats. Canal was closed to ship traffic. Quite a pleasant surprise and a treat! https://www.boston25news.com/news/local/cape-cod-canal-closed-endangered-whales-move-through/7NJQQA2FCJGA5N5XPCQDEUY6R4/

Green-and-black Poison Dart Frog (Dendrobates auratus)
Distribution: The green-and-black poison dart frog is found in the humid lowlands from southeastern Nicaragua on the Atlantic slope and southeastern Costa Rica on the Pacific coast through Panama to northwestern Colombia. Introduced populations exist on Oahu;the species was purposefully introduced there in 1932 for mosquito control. Later on, it seems to have also become established on Maui.
Poison: The green-and-black poison dart frog, while not the most toxic poison dart frog, is still a highly toxic animal. The very small amount of poison the frog possesses is enough to make a human heart stop beating. However, like most poison dart frogs, the green-and-black poison dart frog only releases its poison if it feels threatened, and wild specimens can be handled provided the human holding it is calm and relaxed. The green-and-black poison dart frog, as with all poison dart frogs, loses its toxicity in captivity due to a change in diet. This has led some scientists to believe that the green-and-black poison frog actually takes its poison from the mites and other insects on which it feeds.
Behavior: The green-and-black poison dart frog is semi arboreal, hunting, courting, and sleeping in the trees. However, as it is a small frog, it cannot jump far enough to span the distances between trees, so it returns to the ground when it wants to travel. To assist in climbing, the frog has small, sucker-like discs on the ends of its toes, which create a slight suction as the frogs climb, making their grip mildly adhesive.

https://www.inaturalist.org/taxa/21121-Dendrobates-auratus

https://www.herpmapper.org/taxon/Dendrobates_auratus