world's tallest building

Burj Khalifa is the world's tallest building.It's construction is started in 21st September , 2004 and it is ended in 1st October, 2009.But it is opened in 4th January,2010.It's hieght is 829.8 metres (2,721feet). It also known as Burj Dubai.It is the tallest man-made structure in the world.the total cost for Burj Khalifa project is       US$1.5billon.It has broken Taipei 101's record. Burj Khalifa is situated in Dubai,UAE(UNITED ARAB EMRATES) it has 163 floors.

largest animal

The present largest living animal life on earth is the blue whale which is a marine living mammal. its size is 30 meters in lenght and 180 or more metric tons in weight. its body's colour is greyish blue. Darker on the top and becomes lighter when it comes down. it is mostly found in indian or southern ocean. its scientific name is balaenopetra musculus. it has a hole on the top of its body. after some time it releases water from its hole.