Biology today

(Grace) #1
insectivora


  1. Sorex Shrew • The common long-tailed shrew, Sorex araneus, ranges through moist areas of
    Europe and Asia.
    • Body is slender, about 7.5 cm long, with dense fur, short legs, sharply pointed
    sensitive, bewhiskered muzzle or snout and small weak eyes.
    • First pair of incisors are very long, lower canines are absent, all teeth are red.
    • They live in burrows but come out on surface at night.
    • The Indian genus is Soriculus commonly known as ‘chuchunder‘.

  2. Talpa Mole • Moles are also known as ‘chuchunder‘. They differ from shrews in being larger
    and in having enormous shoulder girdle and muscles so that head and trunk
    seem to merge.
    • They are also efficient burrowers.
    • Body is thick, cylindrical and covered by a soft velvety fur.

  3. Erinaceus Hedgehog • Hedgehogs range throughout Europe, Africa and Asia.
    • They have a small globular body, pointed snout, stumpy tail and short legs.
    • Skin is covered with short barbless spines, intermingled with hair, except on the
    belly to protect themselves.
    • When disturbed, they roll up into a ball for protection, so that the spines project
    outward like pins in a pincushion. They are omnivorous creatures.
    • Common Indian name is ‘jhau chuha‘.


Chiroptera


  1. Pteropus Frugivorous
    bat


•    These are the fruit-eating bats found in the Old World tropics and sub-tropics,
including India.
• They are called the flying foxes because of fox-like head, long snout and large
eyes.
• Some of them are the largest of bats with a body 30 cm in length and a
wingspread of 1.5 metres.


  1. Rhinolophus Insectivorous
    bat


•    They are small to medium in size, with small eyes, comparatively short snout and
without claw on second finger.
• Most have special flaps in front of their large ears, used for navigation or echo-
location.


  1. Desmodus Vampire bat • Tree vampire bats occur in tropics and are famous because of their sanguivorous
    habit.
    • They often feed on fresh blood of sleeping domestic animals, even human
    beings.
    • Their incisors are razor-sharp with which they slit the skin of the prey, where hair
    and feathers are scanty, and the oozing blood is lapped up.
    • Pinna are large with a lobe called tragus.


Edentata


  1. Bradypus Sloth • Sloths of tropical America are distinctly arboreal and slow-moving creatures.
    • They have short rounded heads, inconspicuous ears, forward-looking eyes and
    no tails.
    • The hands and feet bear 2 or 3 long and curved claws by which the animal
    hangs upside down from tree branches, eating, sleeping and moving in that
    position.
    • They feed mainly on fruits and leaves.

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