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Papaya was seen again Saturday near Redondo Canyon by Eric Martin, aquarist director at Roundhouse Aquarium, who used an underwater device called a hydrophone to listen for the rhythmic clicking of the whale’s echolocation to find him.

“I had kind of given up and thought it’s never going to happen,” said Jeremy Brodt, an aquarist and galleries manager at the New England Aquarium.

“Many people don’t realize that not all penguins live in the ice and snow. Little blues are from Australia and New Zealand, where the climate is surprisingly similar to ours,” said Kayla Strate, lead penguin aquarist.

Taylor Sakmar, also a Monterey Bay aquarist, came to Cape Cod to help build a new kind of facility for many-armed animals.

In 1998, at the outset of the project, scientists at the Michoacana University of Mexico's Aquatic Biology Unit received five pairs of fish from Chester Zoo, delivered by the English aquarist Ivan Dibble.