Ap Biology Essay Kangaroo Rats

Ap Biology Essay Kangaroo Rats-48
Though life on land originated from the seas, terrestrial animals have returned to an aquatic lifestyle on several occasions, such as the fully aquatic cetaceans, now very distinct from their terrestrial ancestors.

Though life on land originated from the seas, terrestrial animals have returned to an aquatic lifestyle on several occasions, such as the fully aquatic cetaceans, now very distinct from their terrestrial ancestors.

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The primary means by which fish generate thrust is by oscillating the body from side-to-side, the resulting wave motion ending at a large tail fin.

Finer control, such as for slow movements, is often achieved with thrust from pectoral fins (or front limbs in marine mammals). the spotted ratfish (Hydrolagus colliei) and batiform fish (electric rays, sawfishes, guitarfishes, skates and stingrays) use their pectoral fins as the primary means of locomotion, sometimes termed labriform swimming.

Gliding has evolved on more occasions than active flight.

There are examples of gliding animals in several major taxonomic classes such as the invertebrates (e.g., gliding ants), reptiles (e.g., banded flying snake), amphibians (e.g., flying frog), mammals (e.g., sugar glider, squirrel glider).

A stomatopod, Nannosquilla decemspinosa, can escape by rolling itself into a self-propelled wheel and somersault backwards at a speed of 72 rpm.

They can travel more than 2 m using this unusual method of locomotion.This surface locomotion takes advantage of the surface tension of water.Animals that move in such a way include the water strider.Flying animals must be very light to achieve flight, the largest living flying animals being birds of around 20 kilograms.Rather than active flight, some (semi-) arboreal animals reduce their rate of falling by gliding.Morphology is therefore important for efficient locomotion, which is in most cases essential for basic functions such as catching prey.A fusiform, torpedo-like body form is seen in many aquatic animals, though the mechanisms they use for locomotion are diverse.Some modes of locomotion are (initially) self-propelled, e.g., running, swimming, jumping, flying, hopping, soaring and gliding.There are also many animal species that depend on their environment for transportation, a type of mobility called passive locomotion, e.g., sailing (some jellyfish), kiting (spiders), rolling (some beetles and spiders) or riding other animals (phoresis).Water striders have legs that are hydrophobic, preventing them from interfering with the structure of water. The female, above, is in fast forward flight with a small angle of attack; the male, below, is twisting his wings sharply upward to gain lift and fly up towards the female. Because it is impossible for any organism to have a density as low as that of air, flying animals must generate enough lift to ascend and remain airborne.One way to achieve this is with wings, which when moved through the air generate an upward lift force on the animal's body.

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