Friday, 10 January 2014

VERTEBRATES - MAMMALS - MARSUPIALS - WATCH THIS VIDEO OF A NEWBORN BABY GREY KANGAROO!


 We have started studying vertebrates. We studied the main characteristics of vertebrates. They are animals with an endoskeleton and a backbone. They have a body divided into a head, a trunk and most have a tail. They have articulated limbs, that can be legs, fins or wings, they have a well developed nervous system and bilateral symmetry.
 The first group of vertebrates we have studied are mammals. We mentioned the physical characteristics of mammals, their nutrition, respiration, reproduction and interaction.
 There are 3 groups of mammals. 
 The most abundant group are placentals, these give birth to well developed offspring. 
 Another group are marsupials, these give birth to an embryo which continues its development in a pouch. Kangaroos and koala bears are marsupials. The way in which marsupials are born and how they develop in the pouch is unknown for must of you and this is why I suggest you watch this very interesting video in which you can see how females give birth to very undeveloped offspring. In the pouch the offspring climb up the mother's body in search of a mammary gland, which it begins to feed off.
 The last group of mammals are monotremes. We have mentioned the rare combination of physical characteristics  these animals have and why scientists have decided to classify them as mammals.



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