It’s hard to see what’s on the bottom of the sea: Discover sharks that you shouldn’t step on.

Ever wondered what the most special-looking shark species could be? Well, the tasseled wobbegong shark is definitely a good candidate. Sometimes referred to as carpet sharks, these animals have an extraordinary, flattened appearance, due to their characteristic, branched lobes that extend from their heads. Although these sharks were first described in 1867, they remain mysterious as we still really don’t know them.

A tasselled wobbegong. You definitely shouldn’t step on it! SourceUPDATE: Apparently, this isn’t a wobbegong but a type of anglerfish in the Lophiidae family. You still shouldn’t step on it though!

The tasselled wobbegong (Eucrossorhinus dasypogon) is a species of carpet shark in the family Orectolobidae that inhabits the shallow coral reefs off northern Australia, New Guinea, and the adjacent islands. Reaching 1.8 m (5.9 ft) in length, this species has a broad and flattened body and head, but its most distinctive trait is a fringe of branching dermal flaps around its head, which extends onto its chin that enable it to camouflage itself against the coral reef environment, in which it lives.

During the day, the solitary tasselled wobbegong can generally be found lying inside caves or under ledges with its tail curled up, but when the night comes, it emerges and actively forages for food – even for humans, if the opportunity arises. They have been reported to bite and kill people even when unprovoked, with most attacks probably resulting from people accidentally disturbing them or being misperceived as prey.

No, it’s not part of the coral reef. Image credit: Jon Hanson

The tasselled wobbegong is considered the most specialized member of its family. Its ornate coloration and complex outlook grants it excellent camouflage, while it is probably a slower swimmer than related species. But that by no way means a disadvantage for this guy.

While these animals are solitary and individual sharks have a small home range, containing several preferred resting spots that are used repeatedly, this species becomes more active at night, swimming onto the reef to hunt. Its enormous mouth allows even sizeable prey to be swallowed, with one documented case of a 1.3 m (4.3 ft) long individual consuming a 1.0 m (3.3 ft) long brownbanded bamboo shark. Although the carpet shark is most active at night, it is an opportunistic ambush predator during daytime, preying upon schooling nocturnal fish such as soldierfish and squirrelfish, and sweepers that often shelter in the same cave. Also, tiny fish and crustaceans have been seen settling atop the resting wobbegong’s head, attracting larger fish that are in turn attacked by the wobbegong. Wow.

In fact, observations of these animals in captivity have further revealed that this species seems to engage in an active luring behavior. And a really special one, for that matter. When the tasselled wobbegong perceives food nearby, it begins to slowly wave its tail back and forth, which makes its caudal fin resemble a small fish, complete with a dark eyespot at the base. And since the shark typically rests with its head elevated, it is situated within easy distance of any prey drawn by that curious tail. Even humans.

Yupp, wobbegongs have several records of attacks on people that were apparently unprovoked, and the tasselled wobbegong has a reputation for even more aggressive behavior than related species. Australian biologist Gilbert Whitley even wrote in 1940 that it “attacks and generally kills the natives” of Papua New Guinea. And while it’s unclear whether Whitley’s claim held any truth, this species is certainly capable of inflicting severe wounds on humans. That said, the tasselled wobbegong is also an ecotourism attraction and many divers have approached it without incident. But given this shark’s cryptic appearance and poor vision, humans should definitely exercise caution to avoid accidentally harassing it or causing it to mistake a hand or foot for prey.

Perfect camouflage. Again, don’t step on it! Image credit: Leonard Low

So, in those few spots where the tasselled wobbegong can be found, you should definitely be on alert. Unfortunately though, even those few spots are decreasing in number, as the shark’s range is negatively affected by extensive fishery activity and habitat degradation from pollution, blast fishing, and coral removal.

We definitely shouldn’t step on it indefinitely.

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