University of California
Ucmp: Aves More on Morphology
A good discussion of the major adaptations of the skeleton of birds in order to adapt to flight.
University of California
Ucmp: Vertebrate Flight
A very solid Berkeley site on the structure and function of bird flight. Topics include skeletal and muscular adaptations for flight.
Open Door Team
Open Door Web Site: Movement in the Air
A site on how birds fly discusses their anatomy that allows them to fly. Also discusses the role that feathers play in flight. Also includes a section which discusses other insects that fly.
Earth Life
Earth Life: Mammalian Skeleton
A very good overview of the structure and function of the mammalian skelton. Includes a nice graphic of an elephant skeleton which serves as a typical (though big) example.
Other
Ladywildlife's How Mammals Move
Discusses the different ways mammals move. Also presents some key facts about some unique mammals and how they move.
Other
Sun Site: General Characteristics of Reptiles
This site explains what reptiles are, where they live, what they look like, how they move, how they breathe, what they eat, what their sense organs are, and how they reproduce.
Earth Life
Earth Life: Locomotion of Mammals
Good site for some general information on the movement of mammals. Gives a description and gives the average speed of a variety of animals.
Other
Look d.com: Gas Bladder
This site, which is from LookD.com, provides information about the bony fish gas bladder. The information that is presented at this site is medium in length and interesting, making it worth checking out.
Other
Look D: How Fish Swim
This site, which is provided for by LookD.com, gives brief but factual information on the way in which fish swim.
Other
Digital Frog International: Frog Skeleton
A diagram of a frog is provided here. This image was produced digitally and no frogs were harmed in the process.