Ap Biology Essay Kangaroo Rats

Velella sails always align along the direction of the wind where the sail may act as an aerofoil, so that the animals tend to sail downwind at a small angle to the wind.While larger animals such as ducks can move on water by floating, some small animals move across it without breaking through the surface.Animals move for a variety of reasons, such as to find food, a mate, a suitable microhabitat, or to escape predators.

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Velella, the by-the-wind sailor, is a cnidarian with no means of propulsion other than sailing.

A small rigid sail projects into the air and catches the wind.

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.

Marine mammals oscillate their body in an up-and-down (dorso-ventral) direction. penguins, diving ducks, move underwater in a manner which has been termed "aquatic flying".

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Other swimming animals may rely predominantly on their limbs, much as humans do when swimming.This requires little energy to maintain a vertical position, but requires more energy for locomotion in the horizontal plane compared to less buoyant animals.The drag encountered in water is much greater than in air.Gliding is heavier-than-air flight without the use of thrust; the term "volplaning" also refers to this mode of flight in animals.This mode of flight involves flying a greater distance horizontally than vertically and therefore can be distinguished from a simple descent like a parachute.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.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.Dolphins sometimes ride on the bow waves created by boats or surf on naturally breaking waves.In water, staying afloat is possible using buoyancy.If an animal's body is less dense than water, it can stay afloat.

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