Feathers, laying of eggs and toothless beaked jaws arethat distinguish birds from other vertebrate animals .There are more than 10,000 knownof birds. ()More than half of all bird species belong to the order(house sparrow is one among them). There are around 5,700 species of passerine. ()Birds are present in all the continents including.Ostrich, Cassowary and Emu areby weight and length and all of them are flightless birds.Ostrich is also thethat can reach the speed of 45 mph.It is commonly assume that birds have poor. But it has been proved that this is not true for all types of bird species. Studies show that kiwis and few other bird species havesense of smell. ()Another misconception about birds is their absence of. Experiments have proved taste sense in several birds including ducks, hummingbirds and sandpipers. (