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secretion known to mankind. Only 200 microgram of it is enough to kill a man. variations but natural selection also reduces genetic variations by eliminating alleles. Thus evolution by natural selection bites the 96,500 kms. If blood has to fill all these capillaries, no blood will be left in arteries and veins. Therefore, body selectively supplies There are two living species of beavers, the Euras*an, Castor fiber and the North American, Castor canadensis. Beavers belong to the mammalian family Castoridae of Rodentia that evolved in Oligocene epoch but the genus Castor evolved much later in Pleistocene, about 2 million years ago. The two living species are genetically different and have different number of chromosomes (48 in the European and 40 in the North American species). The two species are also not known to hybridize and produce viable offspring. Beavers are famous for building large dams across rivers in northern Canada by felling large trees, an amazing feat for a small an*mal.. Read More The kea (Nestor notabilis) is a parrot-like bird of family Strigopidae, which is about the size of a hen and occurs in the alpine regions of New Zealand. Their extraordinary intelligence is comparable to the primates and hence they are sometimes nicknamed 'mountain monkeys'. Being highly inquisitive, keas are notorious for exploring and manipulating objects often in residential areas where they damage articles such as shoes, car seats sofas, bags etc. with their sharp and curved beak. They are highly intelligent birds with quick learning abilities. Researchers at the Universities of Vienna and Oxford tested the Kea’s problem-solving abilities b.. Read More Ethology is the study of an*mal behaviour to find out natural responses of an*mals to various environmental stimuli. Some studies are also done in laboratory conditions to elicit measured responses. Therefore, ethology involves laboratory as well as field studies and has strong relationship with other sciences such as ecology, environmental science, neurology, physiology, psychology and