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News, opinions, photos and facts from Ocean Conservancy

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How to Tell the Difference Between Squid and Cuttlefish

Posted On April 7, 2017 by

The octopus is one of the most well-recognized animals in the sea, but what about their lesser-known cousins? Squid and cuttlefish may not get as many Hollywood roles as their eight-armed relatives, but they’re equally as interesting. Take a minute to explore these tentacled invertebrates—and learn how to tell them apart.

Let’s start with what they have in common. Both squid and cuttlefish are part of class Cephalopoda, which is a type of mollusk that also includes octopus and nautilus. Unlike other mollusks, like clams and snails, most cephalopods have lost their hard outer shells. Cephalopods get their name from the Greek word meaning “head-feet”, because their arms encircle their heads. Both squid and cuttlefish are known as ten-armed cephalopods because they have eight short arms and two long tentacles (as opposed to eight-armed cephalopods like octopuses).

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How to Tell the Difference Between a Seal and a Sea Lion

Posted On February 24, 2017 by

They’re two of the ocean’s most recognizable—and adorable—residents. But can you tell seals and sea lions apart?

Let’s start with the basics. Seals and sea lions are both in the suborder pinnipedia, a group of fin-footed mammals that also includes walruses. All pinnipeds have broad torsos and narrow hips that help them remain streamlined underwater. You can find pinnipeds all over the world, from walruses in the chilly Arctic to Hawaiian monk seals in the balmy Pacific.

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