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A mammal that uses its webbed forelimbs to fly.

Bat

A mammal that uses its webbed forelimbs to fly.

An illustration of Chanute's biplane gliding machine.

Biplane Gliding Machine

An illustration of Chanute's biplane gliding machine.

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the frog makes waved lines while moving through the water.

Swim Lines of Frog

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the…

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly) referred to as flying lemurs. The two species of Galeopithecus are now placed in a sub-order of Insectivora, and regarded as the vegetarian analogues of the insect-eating bats. The common species, G. volans, is about the size of a cat and has a flying-membrane. The teeth are remarkable, the lower incisors being comb-like, while the upper outer incisor at each side has two roots. Galeopithecus primarily inhabit forests. They feed upon leaves, fruit, eggs, insects, and even small birds. They are nocturnal. Though incapable of true flight, they can take long, flying leaps.

Galeopithecus

Galeopithecus is the generic name of certain mammals from the Malayan region, commonly (incorrectly)…

An illustration of Chanute's multiple gliding machine.

Chanute's Multiple Gliding Machine

An illustration of Chanute's multiple gliding machine.

A gliding mammal that uses the flaps of extra skin between their legs to glide from higher to lower locations.

Flying Lemur

A gliding mammal that uses the flaps of extra skin between their legs to glide from higher to lower…

"A contrivance for enabling a person to glide swiftly on ice, consisting of a steel runner fixed either to a wooden sole provided with straps and buckles, or to a light iron or steel framework having adjustable clamps or other means of attachment to a shoe or boot. C is a roller skate in which a plate with rollers replaces the runner." — Whitney, 1889

Roller Skate - Side View

"A contrivance for enabling a person to glide swiftly on ice, consisting of a steel runner fixed either…