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Page 37 PIGEONS AND DOVES Columbiformes Species 298 SANDGROUSE Pteroclidiformes Species 16 TINAMOUS HUMMINGBIRDS AND SWIFTS Tinamiformes Species 46 Apodiformes Species 429 FOWL EMUS AND CASSOWARIES OSTRICH Galliformes Largely terrestrial birds, with short, stout, decurved bills, and strong legs and feet. Short wings typically give short bursts of low flight. This group includes the jungle fowl, from which domestic fowl were derived. Casuariformes Species 4 Struthioniformes Species 1 Piciformes Neoaves with feet having two toes pointing forward and two backward.

They include 10,000 diverse species of marine and freshwater fishes. ANIMAL KINGDOM 40 Fishes Fishes are vertebrate animals that are adapted to live, swim, and breathe in fresh or salt water. They are the most numerous and diverse vertebrate animals on Earth and can be found in every conceivable aquatic habitat. Fishes do not form a natural group. The general term “fishes” includes four groups of vertebrates that are as different from one another as mammals, reptiles, and birds. The largest group is the bony fishes, which includes familiar species such as cod, salmon, and trout.

Males have a copulatory organ called a clasper and females give birth to live young or lay large egg capsules. Special sense organs, called ampullae of Lorenzini, allow cartilaginous fish to track other animals by detecting their electrical fields. Sharks have strong, replaceable teeth and rough skin covered in tiny, toothlike dermal denticles. Skates and rays are flat with winglike pectoral fins and a long, thin tail. The chimaeras are scaleless with a large head and ratlike tail. 5 m). A pair of barbels on the distinctive saw-shaped snout are used in combination with taste sensors to locate prey, such as small fishes and invertebrates, on the seabed.

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