<P> Due to its large size , several organs of the blue whale are the largest in the animal kingdom . A blue whale 's tongue weighs around 2.7 tonnes ( 3.0 short tons ) and , when fully expanded , its mouth is large enough to hold up to 90 tonnes ( 99 short tons ) of food and water . Despite the size of its mouth , the dimensions of its throat are such that a blue whale can not swallow an object wider than a beach ball . The heart of an average sized blue whale weighs 400 pounds ( 180 kg ) and is the largest known in any animal . During the first seven months of its life , a blue whale calf drinks approximately 380 litres ( 100 US gal ) of milk every day . Blue whale calves gain weight quickly , as much as 90 kilograms ( 200 lb ) every 24 hours . Even at birth , they weigh up to 2,700 kilograms ( 5,950 lb ) -- the same as a fully grown hippopotamus . Blue whales have proportionally small brains , only about 6.92 kilograms ( 15.26 lb ) , about 0.007 % of its body weight , although with a highly convoluted cerebral cortex . The blue whale penis is the largest penis of any living organism and also set the Guinness World Record as the longest of any animal 's . The reported average length varies but is usually mentioned to have an average length of 2.4 to 3.0 m ( 8 to 10 ft ) . </P>
<P> Due to its large size , several organs of the blue whale are the largest in the animal kingdom . A blue whale 's tongue weighs around 2.7 tonnes ( 3.0 short tons ) and , when fully expanded , its mouth is large enough to hold up to 90 tonnes ( 99 short tons ) of food and water . Despite the size of its mouth , the dimensions of its throat are such that a blue whale can not swallow an object wider than a beach ball . The heart of an average sized blue whale weighs 400 pounds ( 180 kg ) and is the largest known in any animal . During the first seven months of its life , a blue whale calf drinks approximately 380 litres ( 100 US gal ) of milk every day . Blue whale calves gain weight quickly , as much as 90 kilograms ( 200 lb ) every 24 hours . Even at birth , they weigh up to 2,700 kilograms ( 5,950 lb ) -- the same as a fully grown hippopotamus . Blue whales have proportionally small brains , only about 6.92 kilograms ( 15.26 lb ) , about 0.007 % of its body weight , although with a highly convoluted cerebral cortex . The blue whale penis is the largest penis of any living organism and also set the Guinness World Record as the longest of any animal 's . The reported average length varies but is usually mentioned to have an average length of 2.4 to 3.0 m ( 8 to 10 ft ) . </P>
how big is the mouth of a blue whale
how big is the mouth of a blue whale
large enough to hold up to 90 tonnes ( 99 short tons ) of food and water
large enough to hold up to 90 tonnes ( 99 short tons ) of food and water