Lucas Bustamante / Troschel's tree frog / Calcar tree / Convict tree frog (Hypsiboas calcaratus) portrait, on leaf, Cuyabeno, Sucumbios, Ecuador.

Edwin Giesbers / Troschel's tree frog (Hyla calcaratus) captive, occurs in South America.

Alex Mustard / Mottled sea star (Evasterias troschelii) in shallow water beneath the sun. Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

GEORGETTE DOUWMA / Troschel's sea star {Evasterias troscheli} in tidepool during low tide, Tongue Point, Washington, USA.

Shane Gross / Mottled seastar (Evasterias troschelii) close-up detail of gills and spines, Vancouver Island, British Columbia, Canada.

Morley Read / Blue-flanked treefrogs (Boana calcarata) perching in vegetation above a rainforest creek. Yasuni National Park, Ecuador.