Which mammals have the fattest milk?

1 SEALS

Fat content: Up to 60 % The babies grow fast, and the fat milk help them develop a layer of fat. Human breast milk contains some 3.5 % fat.

2 WHALES

Fat content: Up to 40 % A blue whale baby consumes 600 l of milk daily, gaining 90 kg a day for the first seven months of its life.

3 POLAR BEARS

Fat content: About 33 % At birth, a polar bear baby weighs around 500 g, but the breast milk makes it grow to 15 kg in three months.

4 REINDEER

Fat content: Some 22 % The fat milk allows the calves to quickly gain weight, so they can make it in the cold of northern Scandinavia and Asia.

5 ELEPHANTS

Fat content: Up to about 15 % In its first year, a baby elephant gains about one kg a day thanks to breast milk. It uses its mouth to drink.