If you want to know the record holder for the largest fish in the world, then you're in the right place. The largest fish is the whale shark, Rhincodon typus. The largest confirmed individual was 12.65 metres (41.50 ft) in length. The heaviest weighed more than 36 tonnes (79,000 lb), but unconfirmed claims report considerably larger whale sharks. The shark is found in tropical and warm oceans, lives in the open sea with a lifespan of about 70 years. The species originated about 60 million years ago. Although whale sharks have very large mouths, they feed mainly, though not exclusively, on plankton, microscopic plants and animals.
Don't confuse the whale share with the blue whale. The latter is larger than the whale shark, but is considered a mammal (not a fish). In fact The blue whale is the largest mammal in the world. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight. Long and slender, the blue whale's body can be various shades of bluish-grey dorsally and somewhat lighter underneath. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill.
The largest living bony fish is the ocean sunfish (Mola mola), a member of the order Tetraodontiformes. Sunfish have been recorded at sizes as large as a length of nearly 3.6 m (12 ft), a height of 4.5 m (15 ft) from fin to fin and a weight of about 5,000 lb (2,300 kg). Much larger bony fish existed prehistorically, the largest ever known having been Leedsichthys, of the Jurassic period. Estimates of the size of this fish range from 9 m (30 ft) to 30 m (100 ft), but a maximum size of 16 m (53 ft) seems most realistic.
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However the biggest land mamal in the world is the African Elephant. African elephants males stand 3.2–4.0 m (10–13 ft) tall at the shoulder and weigh 4,700–6,048 kg (10,000–13,330 lb), while females stand 2.2–2.6 m (7.2–8.5 ft) tall and weigh 2,160–3,232 kg (4,800–7,130 lb). The African Elephant is larger than the Asian Elephant. These mammals have very strong social bonds and live in family groups headed by a female (called a cow). Males (called bulls) occasionally join the group. Elephants are excellent swimmers. Elephants have few natural enemies except man, and they are in danger of extinction due to loss of habitat and poaching (they are killed for their ivory tusks).