Airborne Sound

1. The streamlined bodies of whales do not have the external ear structures called pinnae that land mammals use to gather airborne sound. (Web site)
2. The mechanism of these fossil whales lacks sophistication, and still retains some of the key elements that land mammals use to hear airborne sound. (Web site)

Sea

1. Scientists believe that early whales arose 55 to 65 million years ago from (now extinct) ancient land mammals that ventured back into the sea. (Web site)
2. Evolutionary scientists hypothesize that whales arose between 55 and 65 million years ago from now extinct land mammals that ventured back into the sea. (Web site)

Air

1. Although they breathe less often than land mammals, whales will compensate by taking deeper breaths and extracting more oxygen from the air they breathe.

Breath

1. Second, each breath provides an 80 to 90 per cent renewal of air in a whale's lung, compared with only 10 to 20 per cent in most land mammals. (Web site)
2. Whales can hold their breath longer than land mammals because of a chemical called myoglobin. (Web site)

Flippers

1. The bones of the flippers resemble the jointed limbs and digits of land mammals. (Web site)

Monophyletic Group

1. Whales evolved from land mammals and appear to form a monophyletic group.

Sea Otters

1. Family Mustelidae: sea otters are the only marine member of the mustelid family, which includes land mammals such as river otters, weasels, and badgers.

Marine Mammals

1. Albinism or pseudo-albinism is uncommon but does occur widely in land mammals as well as marine mammals. (Web site)

Large

1. The dolphin brain is large and highly complex and is different in structure from that of most land mammals. (Web site)

Several Types

1. Their teeth, like those of most land mammals, still show differentiation into several types. (Web site)

Humans

1. Only the Boreoeutherian land mammals, the large group of mammals that includes humans, have externalized testes. (Web site)
2. Only a few species of wild land mammals are found in the Faroe Islands today, all introduced by humans. (Web site)

Reptiles

1. ANIMALS OF THE AGE OF REPTILES. LAND REPTILES. DINOSAURS corresponding to the larger quadrupeds or land mammals of today. (Web site)
2. No land mammals, reptiles, amphibians, butterflies, or snails have recently been found at Inaccessible. (Web site)

Hippopotamus

1. Whales evolved from land mammals, where their closest relative is the hippopotamus.

Archaeocetes

1. Archaeocetes also had nostrils near the tip of the nose, like land mammals, rather than a blowhole on the top of the head. (Web site)

Salinity

1. However, the salinity in the whales bodily fluids is much higher than land mammals but it is still lower than the seawater. (Web site)

Whales

1. Unlike land mammals, whales gave up ties to the land about 50 million years ago when they found rich food resources in the water.
2. Like all members of the order, whales evolved from land mammals which returned to the sea, probably in the Eocene, between 55 and 34 million years ago. (Web site)
3. Unlike land mammals, whales breathe through "blowholes" on the tops of their heads and have no fur or hind legs. (Web site)

Basilosaurus

1. Basilosaurus is one of the primitive whales known as archaeocetes, which evolved from land mammals and later evolved into the two types of modern whale.

Pectoral Flippers

1. The pectoral flippers (at the sides of the body) are for steering; they contain bones homologous to the forelimbs of land mammals. (Web site)

Cetaceans

1. But evolutionists believe that cetaceans evolved from land mammals.
2. Cetaceans evolved from land mammals that adapted to marine life about 50 million years ago.
3. Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.

Mammals

1. Mammals Apart from bats, New Zealand had no land mammals until humans arrived, but there have been fossil marine mammals found.
2. Like other mammals, Pakicetus and Ambulocetus, which are accepted as land mammals, are generally agreed to have had fur-covered bodies.
3. The lake contains mammals such as Hippo, Otters, Marsh Mongooses and has many more land mammals on its shores, such as Water Buck, Zebra and Giraffe.

Land Mammals

1. Since they are also mammals, the consensus phylogeny indicates that whales and dolphins evolved from land mammals with legs. (Web site)
2. The cetaceans (whales, dolphins and porpoises) are marine mammal descendants of land mammals.
3. However, Basilosaurus was fully aquatic, so hardly transitional between land mammals and whales.

Categories

1. Life > Animals > Vertebrates > Mammals
2. Pectoral Flippers
3. Evolutionists
4. Forelimbs
5. Vertebrates > Mammals > Marine Mammals > Cetaceans
6. Books about "Land Mammals" in Amazon.com
   

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