Page 40 - Shark
P. 40

Continued from previous page

                                                                                        Secret agent
                                                                                    Spies work undercover
                                                                                      on secret missions.
                                                                                   Some kinds of shark are
                                                                                    secretive too, and hide
                                                                                   from predators by using
                                                                                           camouflage.

                                                                                            Oriental
                                                                                         wObbegOng
                                                                                    This shark lives along
                                                                                 the coasts of Japan, China,
                                                                                  Vietnam, the Philippines,
                                                                                  and Korea in the western
                                                                                    Pacific. It grows to just
                                                                                   over 3 ft (1m) in length.
                                                                                     Wobbegongs are not
                                                                                     normally aggressive,
         Japanese wobbegong                                                             but people have
                                                                                       been bitten when
                                                 Lobe                    they have stepped on a wobbegong by
                                                                          mistake, because they are difficult to
                                                                          see. Fishermen have also been bitten
                                                   Barbel                 by wobbegongs caught in their nets.
        Undercover sharks

        Sharks living on the seabed like to
        hide. The colors and patterns on their
        skins help these sharks, such as wobbe­
        gong, swell, and angel sharks, to be
        camouflaged, or to blend in with
        their surroundings. They have
        blotches, spots, or stripes that
        make them difficult to see on
        sand, among rocks, seaweeds,
        or corals on the seabed.
        Wobbegongs have elaborate
        disguises with blotchy skins and
        lobes on their heads that look like
        bits of seaweed. Other sharks, like swell
        sharks, hide in crevices, while angel
        sharks cover themselves with sand. Why                                                        nOw yOu See me,
        hide if you are a shark with sharp teeth?                                                     nOw yOu dOn’t
        These undercover sharks often lie                                                              It is difficult to
                                                                                                        see angel sharks
        in wait for prey, like fish and crabs,                                                           (pp. 36–37) lying
        to move near, then snap them                                                                    on the seabed,
        up. Also, hiding helps small                                                                    because they are
        sharks avoid being eaten                                                                      flattened and their
        by larger predators.                                                                          mottled skin looks like
                                                                                                      sand (top left). To
                                                                                                      complete their superb
                                                                                                      disguise, angel
                                                                                                      sharks shuffle their
                                                                                                      pectoral fins to
                                                                                                      bury themselves
                                                                                                      in the sand (center
                                                                                                      left). When hiding
                                                                                                      under a layer of sand,
                                                                                                      their eyes poke above
                                                                                                      the surface (bottom
                                                                                                      left) keeping watch
                                                                                                      for their prey like fish
                                                                                                       to swim by. When a
                                                                                                        fish comes near, the
                                                                                                        angel shark lunges
                                                                                                        forward, snapping its
        auStralian Shark with a beard                                                                   jaws shut around it.
        The tasseled wobbegong’s beard has                                                            If divers approach, they
        many branched lobes around its                                                                may leave their hiding
        mouth, which its prey, such as fish                                                           place and swim off.
        and shrimp, may mistake for                                                                   Fishermen catch angel
        seaweed and end up being eaten.                                                               sharks in nets towed
                                                                                                      across the seabed.
   35   36   37   38   39   40   41   42   43   44   45