6 résultats pour "caterpillar"

• Caterpillar

  4 Les industries du batiment et des travaux publics sont les clients les plus importants de Caterpillar. Mail le materiel de Ia societe trouve aussi des debouches sur d'autres chantiers :construction du pipe-line patroller de l'Alaska, preparation des sites de centrales nucleaires, travaux miniers en surface, mise en marche des plates- formes de recherche off-shore... 5 Le reseau commercial de Ia societe, anima depuis Geneve par Caterpillar Overseas, compte 900 agences etrangeres, par l'intermed...

• Butterflies and Moths - biology.

  The smallest butterflies are certain blues that have wingspans of a mere 0.7 cm (0.25 in). The largest are the female giant birdwings of Papua New Guinea, whichmeasure up to 30 cm (12 in) across. Moths range in size from tiny Microlepidoptera, several groups of small moths with wings no more than 0.16 cm (0.06 in) across, togiant silk moths, such as the atlas moth, which may exceed 30 cm (12 in) in wingspan. IV REPRODUCTION AND LIFE CYCLE Butterflies locate potential mates by sight, identifyin...

• Invertebrate - biology.

  animals with a five-pointed design. They live in the sea and move with the help of tiny fluid-filled feet—another feature found nowhere else in the animal world. Zoologists recognize several different groups of worms. The phylum known as flatworms contains the simplest animals possessing heads. Nerves and sense organs areconcentrated in the head. Most flatworms are paper-thin and live in a variety of wet or damp habitats, including the digestive systems of other animals. Roundwormsrepresent anot...

• Invertebrate - biology.

  animals with a five-pointed design. They live in the sea and move with the help of tiny fluid-filled feet—another feature found nowhere else in the animal world. Zoologists recognize several different groups of worms. The phylum known as flatworms contains the simplest animals possessing heads. Nerves and sense organs areconcentrated in the head. Most flatworms are paper-thin and live in a variety of wet or damp habitats, including the digestive systems of other animals. Roundwormsrepresent anot...

• Butterflies.

  When the change is complete, the adult butterfly splits the chrysalis. The insect unfolds its wings andpumps blood and air into them. It spreads out the wings until they dry and harden. The beautifulbutterfly then flies off to slurp nectar from flowers. Most butterflies live only one or two weeks. BUTTERFLY RELATIVES Butterflies are closely related to moths, another type of insect. One difference between butterflies andmoths is how their antennae look. Butterflies have knobs called clubs on the...

• Insects.

  parents. It does not have wings. It may not even have legs. As the insect grows, it starts to changeshape. This change is called metamorphosis. There are two kinds of metamorphosis, called incompleteand complete. Dragonflies, grasshoppers, and crickets are some insects that go through incomplete metamorphosis asthey grow up. The young insects are called nymphs or naiads. The young insect molts, or crawls out ofits exoskeleton, as it grows bigger. It grows a new, larger exoskeleton. Its body chan...