Cow has a large body. They can grow up to the size of 1,3 m in height and 2,6 m in length. Some species can grow even larger than that. The average body weight of a male cow is 1.100 kg and the average weight of a female cow is 720 kg. the gestation period of a cow is about nine months. The average weight of a baby cow, also known as “calf”, is around 25 to 45 kg. The calf primarily feeds on milk from their mother. Their lifespan is around 18 to 22 years.

Most of them have horns on their head, but nowadays a species of hornless cow can be found anywhere in the world. They have a long tail that they can lift and hold on a horizontal position when they want to defecate. The end part of the tail is covered by long black hair. There are various skin colors of cow in the world, some of them are: white, white with some large and black spots in abstract shape, black, brown, yellow, and reddish.

The name orangutan means "man of the forest" in the Malay language. In the lowland forests in which they reside, orangutans live in solitary existences. They feast on wild fruits like lychees, mangosteens, and figs, and slurp water from holes in trees. They make nests in trees of vegetation to sleep at night and rest during the day. Adult male orangutans can weigh up to 200 pounds. Flanged males have prominent cheek pads called flanges and a throat sac used to make loud verbalizations called long calls. An unflanged male looks like an adult female. In a biological phenomenon unique among primates, an unflanged male can change to a flanged male for reasons that are not yet fully understood.

Bornean and Sumatran orangutans differ a little in appearance and behavior. While both have shaggy reddish fur, Sumatran orangutans have longer facial hair. Sumatran orangutans are reported to have closer social bonds than their Bornean cousins. Bornean orangutans are more likely to descend from the trees to move around on the ground. Both species have experienced sharp population declines. A century ago there were probably more than 230,000 orangutans in total, but the Bornean orangutan is now estimated at 104,700 based on an updated geographic range (Endangered), and the Sumatran about 7,500 (Critically Endangered).

A third species of orangutan was announced in November 2017. With no more than 800 individuals in existence, the Tapanuli orangutan is the most endangered of all great apes.