Researchers have discovered a fully warm-blooded fish that lives deep in the Pacific Ocean. Known as opah, the fish produces heat as it swims then distributes the warmth throughout its body, researchers from the National Oceanic and Atmospheric Administration (NOAA) found.

The discovery defies conventional knowledge about fish being cold-blooded creatures, but there are plenty of other weird and even scary creatures in the sea. Here are a few of them:

Carnivorous Coral. Corals typically get nutrients from photosynthetic algae that live within their tissue but not the carnivorous coral, also known as the harp sponge. Discovered off California's coast, this candelabra-shaped coral traps small crustaceans. It spreads a membrane over its prey before using chemicals to slowly digest it. It also reproduces with the aid of sperm packets, which contain spermatophores that float in the water to find another sponge.

Giant Isopod. The giant isopod looks like a big woodlice that lives 2,000 meters below the sea and reaches 30 centimeters long. While these creatures primarily scavenge for food, they are also known to catch live prey. These creatures have also existed since the time when the continents were still stuck together in a mass of land known as Pangea. The giant isopod can also go for four years without food.

Longhorn Cowfish. Some people may find the longhorn cowfish cute, but this creature can be very dangerous because it releases deadly toxin when it is under stress.

Colossal Squid. The colossal squid deserves its name because it can grow to about the size of a bus. It is believed that this squid is a slowing-moving predator that ambushes its prey, which include large fish and other squid that they attract with bioluminescence.

Water Bear. The water bear is a micro-animal that measures less than 1 millimeter long—but do not underestimate it for its size because it can survive in extreme environments. These creatures can live in temperatures ranging from nearly absolute zero to 357℉. They can stand 1,000 times more radiation compared with most animals. Here's more: they can come back to life even after they have dried out for a decade and they are the first animal known to have the ability to survive the vacuum of space.

Fangtooth Fish. The fangtooth has been seen as deep as 5,000 meters below sea level, where there is 500 times greater pressure than on land. This pressure can crush humans like pancake.

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