About 5,000 species of crustaceans in the order Isopoda live in Earth’s oceans. According to the National Oceanic and Atmospheric Administration, they all have two pairs of antennae, compound eyes, ...

Few complete skeletons remain of this gentle behemoth, who was destroyed by explorers and fur traders in the Arctic. Illustration of the extinct Steller's Sea Cow (Hydrodamalis gigas), a sirenian that ...