Frogs have 4 digits in fore limb while hindlimb have 5 digits. 䊚 2002 Elsevier Science Inc. Birds. They have the ability to dig in two opposite directions using the hindlimbs. Proportions of the hind limb bones have been used to interpret the locomotor habits of Archaeopteryx and other Mesozoic birds (Hopson, 2001), and body masses of fossil animals have been estimated from regressions on allometric relationships between skeletal measurements and body masses of extant birds (e.g. Birds. They can easily find food that makes them adapt on their surroundings. Humans, birds, many lizards and (at their highest speeds) cockroaches run bipedally. “Fig 34 - Bones of a bird’s hind limb: from a duck, Clangula islandica. Crop is the enlarged part of oesophagus, which stores the food and is an avian adaptation to … Alexander, 1989). The thigh portion of the hind limb runs parallel to the body and during rest remains under the cover of the wings. In birds, the fore limbs are modified for flight and that is what we generally refer to as wings. All birds walk using hindlimbs. However, the high level of morphological diversity encountered complicates the foundation of a good theoretical correlation between morphology, locomotor habits and substrate preference and this, in turn, complicates palaeobiological interpretations. Strigiformes are an order of raptorial birds consisting exclusively of owls: the Tytonidae (barn owls) and the Strigidae (true owls), united by a suite of adaptations aiding a keen predatory lifestyle, including robust hind limb elements modified for grip strength. The hind limbs are modified for walking, perching or swimming. Some of these modifications include:-they have feathers made of keratin-same substance that makes your hair and nails. The smooth muscles in the skin include a series of minute feather muscles, usually a pair running from a feather follicle to each of the four surrounding follicles. The hind limbs of birds have long been considered a key feature in the conquest of different environments. Humans, birds and (occasionally) apes walk bipedally. All birds walk using hindlimbs. The hind limbs of birds also have scales, which confirm their reptilian ancestry. Limbs are much stronger than fins since on land body weight has to be lifted against gravity for locomotion, whereas in water body is supported by water and limbs have to just propel the body forward. Some of these muscles act to raise the feathers, others to depress them. All digits are without nails. Bird - Bird - Muscles and organs: The cardiac (heart) muscles and smooth muscles of the viscera of birds resemble those of reptiles and mammals. A, hip: B, knee: C, heel or ankle-joint; D, bases of toes. They can easily find food that makes them adapt on their surroundings. Tetrapod limbs are believed to have evolved from the pectoral and pelvic fins of lobed fin fishes. 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