A is for Anemone
The soft-bodied sea anemone may appear delicate, but don't be fooled. This animal boasts unexpected predatory prowess.
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B is for Bioluminescence
The anglerfish isn't the only ocean animal using bioluminescence to its advantage. Brittle stars can detach one of their glowing arms to distract predators as they flee.
C is for Coral
Corals have an alarmingly slow growth rate, many expanding mere millimeters or centimeters per year. It can take nearly 10,000 years for a fringing coral reef to form.
D is for Dumbo Octopus
The Dumbo octopus resembles and is named after the flying elephant from the Walt Disney animated classic, but the two large flaps on its mantle are not ears.
E is for Estuary
Estuaries fan the coasts of the United States, from Washington's Puget Sound to Florida's Tampa Bay and the nation's largest estuary—the Chesapeake Bay.
F is for Frogfish
From the brightly spotted clown frogfish to the spine-covered hairy frogfish, these lumpy, bumpy fish feature an eclectic set of colors and other adornments.
G is for Giant Clam
Did you know? Giant clams are the largest living bivalves on Earth.
H is for Hammerhead
Sharks may date back 450 million years, but the first hammerheads didn't appear until about 20 million years ago.
I is for Ice
Did you know? Arctic sea ice plays an important role in regulating the Earth's climate.
J is for Jellies
DYK? The immortal jelly can regress from a medusa back into a polyp, restarting its lifecycle from the beginning.
K is for Kemp's Ridley
Of the seven sea turtle species splashing around the ocean, the Kemp's ridley is one of the smallest—and the most critically endangered.
L is for Lobster
The largest known lobster was caught in Nova Scotia in the 1970s. It weighed 44.4 pounds and was 3.5 feet long!
M is for Mangrove
Mangrove forests flourish in high-salinity waters that would kill most other plants by secreting or excluding salt.
N is for Nudibranch
Did you know? Nudibranchs' bold colors come from their diet!
O is for Oarfish
The giant oarfish can grow to be 56 feet long and weigh nearly 600 pounds.
P is for Peacock Mantis Shrimp
The peacock mantis shrimp is a voracious predator, delivering deadly, backbreaking blows to its prey in just milliseconds.
Q is for Queensland Grouper
A full-grown Queensland grouper can grow to nearly 8.8 feet and weigh an astounding 880 pounds.
R is for Ray
Some devil rays have been observed jumping more than 6 feet from the water.
S is for Sawfish
Though they resemble and are closely related to sharks, sawfish are actually in the ray order.
T is for Tasselled Wobbegong
Tasselled wobbegongs are stealthy ambush predators that strike with deadly speed.
U is for Urchin
Spine-covered sea urchins have no eyes but use hundreds of tube feet to sense light.
V is for Vaquita
Vaquitas are the most endangered marine mammal in the world.
W is for Wolf Eel
Wolf eels are not true eels. They are in the wolffish family!
X is for X-Ray Tetra
Beneath a layer of translucent skin and faint, silvery scales, the spine of this tetra species is clearly visible.
Y is for Yellow Tang
Yellow tangs graze on algae, sometimes even cleaning the shells of green sea turtles.
Z is for Zebra Mussel
The invasive zebra mussel is named for the alternating brown and yellow stripes on its shell.
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