Download A Closer Look at the Animal Kingdom (Introduction to by Sherman Hollar PDF

By Sherman Hollar

Exotic by means of their hugely built psychological colleges and their skill for cause, people are usually stated to reign sovereign within the animal nation. With their complicated interactions, problematic social buildings, and wide diversity of displayed feelings, although, all creatures might be acknowledged to give a contribution uniquely to the planet and to the subsistence of all different beings. This colourful quantity surveys many of the individuals of the animal state and the behavior, behaviors, and actual features that unite and distinguish all animals.

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Ants can be very hospitable. Some species live as guests with other ants or insects; some ants host other insects as guests. A few species live with parasites—insects or other small animals, such as mites, spiders, caterpillars, and beetles, that are fed and sheltered by the colony but that provide nothing in return. Hospitality and cooperation are only one aspect of the ant’s social character, however. It is also capable of warlike behavior. Ants are the only animals other than humans that carry on organized warfare, usually for the capture of slaves.

A notochord is an internal supporting rod extending the length of the body. It is found in the embryos of all chordates, including human beings. Only the most primitive chordates, such as the amphioxus, or lancelet, the lamprey, and the hagfish, retain the notochord as adults, though remnants of the notochord are also present in sharks. In other chordates, such as amphibians, reptiles, birds, and mammals, the notochord is replaced during development of the embryo 61 A closer look At the AnImAl kIngdom The major groups of vertebrates include fish, amphibians, reptiles, birds, and mammals.

Some animals are harmful to humans. Insect pests cause billions of dollars’ worth of damage every year. Animal parasites can cause serious diseases of the human body and of domesticated animals. Fleas and mosquitoes are carriers of microorganisms that cause such serious conditions as malaria and encephalitis. 49 C hapter 3 Animals without Backbones A ll members of the animal kingdom (Animalia) are multicellular—that is, all have bodies composed of many cells. Multicellular animals are sometimes referred to as metazoans, to distinguish them from the protozoans—single-celled organisms that once were classified as animals and later grouped in the kingdom Protista.

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