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When the first Polynesians arrived in Hawaii between A.D. 400 and 800, scientists say they found some 67 varieties of endemic Hawaiian birds, a third of which are now believed to be extinct. They did not find any reptiles, amphibians, mosquitoes, lice, fleas, or even a cockroach.

There were only two endemic mammals: the hoary bat and the monk seal. The hoary bat must have accidentally blown to Hawaii at some point, from either North or South America. It can still be seen during its early evening forays, especially around the Kilauea Crater on the Big Island.

The Hawaiian monk seal, a relative of warm-water seals found in the Caribbean and the Mediterranean, was nearly slaughtered into extinction for its skin and oil during the 19th century. These seals have recently experienced a minor population explosion; sometimes they even turn up at various beaches throughout the state. They're protected under federal law by the Marine Mammals Protection Act. If you're fortunate enough to see a monk seal, just look; don't disturb one of Hawaii's living treasures.

The first Polynesians brought a few animals from home: dogs, pigs, and chickens (all were for eating), as well as rats (stowaways). All four species are still found in the Hawaiian wild today.

Leapin' Lizards! -- Geckos are harmless, soft-skinned, insect-eating lizards that come equipped with suction pads on their feet, enabling them to climb walls and windows to reach tasty insects such as mosquitoes and cockroaches. You'll see them on windows outside a lighted room at night or hear their cheerful chirp.

Birds

More species of native birds have become extinct in Hawaii in the last 200 years than anywhere else on the planet. Of 67 native species, 23 are extinct and 30 are endangered. Even the Hawaiian crow, the alala, is threatened.

The ae'o, or Hawaiian stilt -- a 16-inch-long bird with a black head, black coat, white underside, and long pink legs -- can be found in protected wetlands.

Hawaii's state bird is the nene. It's being brought back from the brink of extinction through strenuous protection laws and captive breeding. A relative of the Canada goose, the nene stands about 2 feet high and has a black head and yellow cheeks. The approximately 500 nene in existence can be seen in only three places: on Maui at Haleakala National Park, and on the Big Island at Mauna Kea State Recreation Area bird sanctuary and on the slopes of Mauna Kea.

The Hawaiian short-eared owl, the pueo, which grows to between 12 and 17 inches, can be seen at dawn and dusk on Kauai, Maui, and the Big Island. According to legend, spotting a pueo is a good omen.

Sea Life

Approximately 680 species of fish are known to inhabit the waters around the Hawaiian Islands. Of those, approximately 450 species stay close to the reef and inshore areas.

Coral -- The reefs surrounding Hawaii are made up of various coral and algae. The living coral grows through sunlight that feeds a specialized algae, which, in turn, allows the development of the coral's calcareous skeleton. The reef, which takes thousands of years to develop, attracts and supports fish and crustaceans, which use it for food and habitat. Mother Nature can batter the reef with a strong storm, but humans have proven far more destructive.

The corals most frequently seen in Hawaii are hard, rocklike formations named for their familiar shapes: antler, cauliflower, finger, plate, and razor coral. Some coral appears soft, such as tube coral; it can be found in the ceilings of caves. Black coral, which resembles winter-bare trees or shrubs, is found at depths of more than 100 feet.

Reef Fish -- Of the approximately 450 types of reef fish here, about 27% are native to Hawaii and are found nowhere else in the world. During the millions of years it took for the islands to sprout up from the sea, ocean currents -- mainly from Southeast Asia -- carried thousands of marine animals and plants to Hawaii's reef; of those, approximately 100 species adapted and thrived. You're likely to spot one or more of the following fish while underwater.

Angelfish can be distinguished by the spine, located low on the gill plate. These fish are very shy; several species live in colonies close to coral.

Blennies are small, elongated fish, ranging from 2 to 10 inches long, with the majority in the 3- to 4-inch range. Blennies are so small that they can live in tide pools; you might have a hard time spotting one.

Butterflyfish, among the most colorful of the reef fish, are usually seen in pairs (scientists believe they mate for life) and appear to spend most of their day feeding. There are 22 species of butterflyfish, of which three (bluestripe, lemon or milletseed, and multiband or pebbled butterflyfish) are endemic. Most butterflyfish have a dark band through the eye and a spot near the tail resembling an eye, meant to confuse their predators (moray eels love to lunch on them).

Moray and conger eels are the most common eels seen in Hawaii. Morays are usually docile except when provoked or when there's food around. Unfortunately, some morays have been fed by divers and now associate divers with food; thus, they can become aggressive. But most morays like to keep to themselves. While morays may look menacing, conger eels look downright happy, with big lips and pectoral fins (situated so that they look like big ears) that give them the appearance of a perpetually smiling face. Conger eels have crushing teeth so they can feed on crustaceans; because they're sloppy eaters, they usually live with shrimp and crabs that feed off the crumbs they leave.

Parrotfish, one of the largest and most colorful of the reef fish, can grow up to 40 inches long. They're easy to spot -- their front teeth are fused together, protruding like buck teeth that allow them to feed by scraping algae from rocks and coral. The rocks and coral pass through the parrotfish's system, resulting in fine sand. In fact, most of the white sand found in Hawaii is parrotfish waste; one large parrotfish can produce a ton of sand a year. Native parrotfish species include yellowbar, regal, and spectacled.

Scorpion fish are what scientists call "ambush predators": They hide under camouflaged exteriors and ambush their prey. Several kinds sport a venomous dorsal spine. These fish don't have a gas bladder, so when they stop swimming, they sink -- that's why you usually find them "resting" on ledges and on the ocean bottom. They're not aggressive, but be very careful where you put your hands and feet in the water so as to avoid those venomous spines.

Surgeonfish, sometimes called tang, get their name from the scalpel-like spines located on each side of the body near the base of the tail. Several surgeonfish, such as the brightly colored yellow tang, are boldly colored; others are adorned in more conservative shades of gray, brown, or black. The only endemic surgeonfish -- and the most abundant in Hawaiian waters -- is the convict tang, a pale white fish with vertical black stripes (similar to a convict's uniform).

Wrasses are a very diverse family of fish, ranging in length from 2 to 15 inches. Wrasses can change gender from female to male. Some have brilliant coloration that changes as they age. Several types of wrasse are endemic to Hawaii: Hawaiian cleaner, shortnose, belted, and gray (or old woman).

Game Fish -- Hawaii is known around the globe as the place for big-game fish -- marlin, swordfish, and tuna. Six kinds of billfish are found in the offshore waters around the islands: Pacific blue marlin, black marlin, sailfish, broadbill swordfish, striped marlin, and shortbill spearfish. Hawaii billfish range in size from the 20-pound shortbill spearfish and striped marlin to the 1,805-pound Pacific blue marlin, the largest marlin ever caught with rod and reel in the world.

Tuna ranges in size from small (1 lb. or less) mackerel tuna used as bait (Hawaiians call them oioi) to 250-pound yellowfin ahi tuna. Other local species of tuna are big-eye, albacore, kawakawa, and skipjack.

Other types of fish, also excellent for eating, include mahimahi (also known as dolphin fish or dorado), in the 20- to 70-pound range; rainbow runner, from 15 to 30 pounds; and wahoo, from 15 to 80 pounds. Shoreline fishermen are always on the lookout for trevally (the state record for a giant trevally is 191 lb.), bonefish, ladyfish, threadfin, leatherfish, and goatfish. Bottom fishermen pursue a range of snapper -- red, pink, gray, and others -- as well as sea bass (the state record is a whopping 563 lb.) and amberjack (which weigh up to 100 lb.).

Whales -- Humpback whales are popular visitors who come to Hawaii to mate and calve every year, beginning in November and staying until spring -- April or so -- when they return to Alaska. On every island, you can take winter whale-watching cruises that will let you observe these magnificent leviathans up close. You can also spot them from shore -- humpbacks grow to up to 45 feet long, so when one breaches (jumps out of the water), you can see it for miles.

Humpbacks are among the biggest whales found in Hawaiian waters, but other whales -- such as pilot, sperm, false killer, melon-headed, pygmy killer, and beaked -- can be seen year-round, especially in the calm waters off the Big Island's Kona Coast.

Sharks -- Yes, there are sharks in Hawaii, but you more than likely won't see one unless you're specifically looking. About 40 different species of sharks inhabit the waters surrounding Hawaii, ranging from the totally harmless whale shark (at 60 ft., the world's largest fish), which has no teeth and is so docile that it frequently lets divers ride on its back, to the not-so-docile, extremely uncommon great white shark. The most common sharks seen in Hawaii are white-tip or gray reef sharks (about 5 ft. long) and black-tip reef sharks (about 6 ft. long).

Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.