The similarities and differences of reptiles and birds are the main features and signs | Table

Birds and reptiles belong to science to two of the five famous classes of terrestrial vertebrates, or fourlegged classes.

If we talk about the external characteristics of birds and reptiles, then it would seem that everything is definitely here: no one will ever confuse the bird and lizard. However, if we consider in more detail, then we can detect of interesting features of the structure of the body, which are similar to these two classes, and it was precisely this similarity that made it possible for scientists to conclude about their related origin.

Scientists suggested that the ancestors of birds could be just ancient reptiles moving on their hind legs and living on trees.

General features of birds and reptiles

The similarity of birds and reptiles is not so unambiguous, but it is still present:

  • And those and others belong to the type of chordovs, which means that both birds and reptiles have a skeleton that supports their body in the form of the spine.
  • skin covering.
  • If we talk about the skin of reptiles, then it is dry, with a keratinized epidermis, as a result of which it is absolutely devoid of any glands, with the exception of the glands of special prescription (for example, femoral pores or musky glands) with horn scales of a variety of structure.

    The skin of birds is quite similar in its structure with reptiles: their skin is also devoid of glands (the exception is usually coccygeal iron), but it is still more mobile and much thinner. Horn scales, like reptiles, have birds only on the legs, and on the body they are replaced with feathers.

    Differences of two types

    The fact that birds are evolutionarily above the reptiles may indicate the size of their brain, namely the significant dimensions of the large hemispheres (including the cerebellum).

    The same conclusion can be drawn from the structure of some systems of birds and reptiles:

  • Blood and respiratory systems: in birds they are more perfect and differ in the presence of double respiration, as well as the separation of arterial type of blood from venous blood circulation.
  • Constant body temperature in birds, which is absent in representatives of reptiles.
  • The musculoskeletal system: here reptiles are equipped with four limbs, which are transformed in fingers and wings in birds.
  • Various veins of the body (albeit with a certain similarity): these are scales and feathers.

    Comparative table of birds and reptiles

    No Signs  Reptiles  BIRDS
    one Number of species 7 000 9,000
    2 The ability to fly Not characteristic Characteristic
    3 Body dimensions From 1 cm (hidden scythe) to 7 m and mass 1 t (Nile crocodile), lengths 11.47 m (anaconda) From 2.8 cm (hummingbird-shmel) to a height of 2.8 m and mass 150 kg (African ostrich)
    four Front limbs Fivefingered They have the appearance of wings
    5 Glands Absent There is a coccygeal gland
    6 The skin is covered Horn, scales or shields Feathers
    7 Features of the structure of the skeleton Interdemonth and interpretable compounds Lightness and strength, bone growth (for example, in the skull)
    eight Beak Absent There is
    9 The growth of the vertebrae Missing Observed (complex sacrum)
    ten Keel Missing There is
    eleven Muscles Less differentiated, the bulk is located on the back of the body, muscles that provide the movement of the limbs located on the limbs More differentiated, the bulk is located on the chest (the chest muscles are highly developed), muscles that provide the movement of the limbs located on the body
    12 Teeth There is Absent
    13 Goiter Missing There is
    fourteen Stomach Well expressed, has a strong muscles 2 departments: glandular and muscular stomach
    fifteen Colon Relatively longer Relatively shorter (the detention of the calf masses would make it difficult to fly)
    16 Fabrice bag Missing There is (has the form of blind outgrowth of cloaks)
    17 Airways Nostrils, larynx, trachea, two bronchi Nostrils, nasal cavity, upper larynx, trachea with a voice apparatus in the lower larynx, bronchi
    eighteen Lungs Have a relatively smaller surface area (cellular) Have a relatively large surface area (spongy)
    19 Parabroron Absent There is
    twenty Air bags Absent There is
    21 Type of breathing Ordinary Double
    22 The total volume of blood Up to 7% body weight Up to 9% body weight
    23 The content of red blood cells in the blood 0.98 million/mm3 3.5 million/mm3
    24 Oxygen container of blood Up to 12% Up to 22%
    25 Heart Threechamber Fourchamber
    26 Aortic arcs There is the right and left arches of the aorta There is only the right aortic arc, the left is reduced
    27 Mixing blood Occurs to mix arterial and venous blood Does not occur (blood flow is separated from the venous)
    28 Body temperature Unstable (coldblooded) Relatively constant (warmblooded)
    29 Bladder There is Missing
    thirty External ear Missing There is (auditory passage)
    31 Women’s sexual system Symmetric (paired ovaries and eggs) Asymmetric (there is only the left ovary and the left oviduct)
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