This complex is home to more than 15,000 fish and aquatic mammals. The focal point of the main building is the four-story, 200,000-gallon Giant Ocean Tank. A four-story spiral ramp encircles the tank, which contains a replica of a Caribbean coral reef and an assortment of sea creatures that coexist. Other exhibits show off freshwater and tropical specimens, a wide variety of jellyfish, denizens of the Amazon, and the ecology of Boston Harbor. The floating marine mammal pavilion, Discovery, is home to performing sea lions. At the Edge of the Sea exhibit, visitors can touch the sea stars, sea urchins, and horseshoe crabs in the tide pool. Naturalist-led harbor tours that teach "Science at Sea" run daily in the spring, summer, and fall.

This complex is home to more than 15,000 fish and aquatic mammals. The focal point of the main building is the four-story, 200,000-gallon Giant Ocean Tank. A four-story spiral ramp encircles the tank, which contains a replica of a Caribbean coral reef and an assortment of sea creatures that coexist. Other exhibits show off freshwater and tropical specimens, a wide variety of jellyfish, denizens ...
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