Apes are primates. Primates are mammals that share the following characteristics:
- hair instead of fur
- fingernails instead of claws
- opposable thumbs
- higher brain-to-body size ratio/high level of intelligence
- prehensility (ability to grasp with fingers and/or toes)
- padded digits with fingerprints
- binocular vision i.e. both eyes focus on one object (depth perception)
- reduced olfactory sense and dependent on vision more than smell
People often confuse apes and monkeys. Although there are a number of differences between apes and monkeys (apes have a longer lifespan, larger body size, larger brain-to-body size ratio, and higher intelligence); the main difference is that monkeys have tails and apes do not have tails.
The difference between great apes and lesser apes is general size. There are two types of lesser apes: gibbons (SE Asia) and siamangs (SE Asia). There are four types of great apes: gorillas (Africa), bonobos (Africa), orangutans (SE Asia), and chimpanzees (Africa).
Chimpanzees are great apes that live in the tropical rain forests of Africa from Sudan and Tanzania in the East to Senegal and Angola in the West. Zaire has the largest population, although chimpanzees have become extinct in some areas. They grow to reach heights of three to five feet, and weigh up to 120 to 200 pounds. They are predominantly black, sometimes with gray on their back after 20 years of age.
Distinctive habits and characteristics of chimpanzees include:
- Chimpanzees are the most social of all the apes and live in communities of between 15 and 120 individuals.
- Their communities are often split into a number of subgroups with a male as the leader of the group.
- Males seldom leave the community where they were born.
- Females often migrate to a new community during an adolescent estrus period.
- Chimpanzees travel mostly on the ground by knuckle walking.
- Chimpanzees groom each other daily, and this activity has an important social function of calming and comforting individuals and solidifying their bonds with each other.
- Mothers often travel alone with their offspring.
- Chimpanzees construct nests at night in which to sleep.
- Chimpanzee males in the wild cooperatively hunt for meat.
- Their diet is mainly fruits with regular amounts of insects, as well as birds and small mammals.
- Chimpanzees use tools to gain access to food, such as fishing for termites with sticks fashioned for the job and cracking open nuts with anvil-like rocks.
- Females in estrus have a prominent swelling of the pink perineal skin that lastis two to three weeks and occurs every four to six weeks.
- Females give birth every four to five years and their gestation period is eight to nine months.
- Chimpanzees have a long mother-infant dependency period. Infants will nurse on their mothers for five years and stay with their mothers several more years learning to care for younger siblings.
- The life span for chimpanzees is 40 to 50 years in the wild and over 50 to 60 years in captivity.
There are four distinct populations of chimpanzees in Africa:
- Pan troglodytes troglodytes (central Africa)
- Pan troglodytes vellerosus (Cameroon and Nigeria)
- Pan troglodytes verus (western Africa)
- Pan troglodytes schweinfurthii (eastern Africa)
Chimpanzee Life Stages
- Infant: Birth-to-five years (nursed and carried by mother)
- Juvenile: Five-to-eight years (still with mother but independent of her for transport and milk)
- Early Adolescence: For females, eight-to-ten years and for males, eight-to-12 years
- Late Adolescence: For females, 11-to-14 years and for males, 13-to-15 years
- Maturity: 16-to-33 years
- Old Age: 33 years to death
The current chimpanzee population is estimated to be between 80,000 to 120,000. The number one threat is the bush meat trade that results in 6,000 chimpanzees per year are killed and eaten by humans. Chimpanzees are currently threatened to extinction by habitat destruction for logging and mining, as well as poaching for the exotic pet trade. When poached, mothers are killed, and if a baby survives the fall of the mother from the tree, the baby is taken by poachers.
Orangutans are found in the tropical rain forests of only two islands in the world: Sumatra (in Indonesia) and Borneo (in Malaysia and Indonesia).
They are the largest arboreal (tree dwelling) animal in the world, reaching heights of four to five feet and weights of 125 to 235 pounds or more. Orangutans are reddish-brown in color and some males grow white or yellow beards. Also characteristic are their bare faces with round eyes and small ears; their long, shaggy hair; long arms; and curled fingers and feet.
Males are much larger than females and develop large pads on their cheeks called “flanges” and large throat pouches at the age 15 to 20. They spend most of their time in trees and subsist mainly on fruit, leaves, flowers, buds, bark and insects.
Distinctive Habits and Characteristics
- Adult males lead mostly solitary lives (except when consorting with females).
- Females associate with their infant and juvenile offspring and occasionally an adult sister or mother for short periods of time.
- Males communicate by the "long call" for territorial and courting purposes.
- Both sexes are arboreal, spending most of their time in trees, building nests at night, swinging through the trees, and eating in the trees.
- The lighter weight an orangutan is, the more active. As they grow older and heavier, they become slower and more cautious, testing each branch before putting their full weight on it.
- They rarely descend from treetops to ground; when they do, they usually walk on all fours (quadrupedal).
- Orangutans’ arms are stronger and longer than their legs (one-and-a-half times longer).
- Their reach from fingertip to fingertip can be as long as eight feet.
- They pucker up their lips to feel the texture of a piece of fruit or food before they bite into it. .
- While they are primarily herbivorous and love jungle fruits like durian, jackfruit, and lychee nuts, orangutans have been observed in the wild catching and eating a small animal called a slow loris.
- Females only give birth every seven to nine years, and their gestation period is about nine months (227 to 275 days).
- Infants nurse on their mothers for four to five years and stay in their mother’s nest for about seven to eight years.
- Females raise their infants alone.
- Orangutans can live 40 years in the wild and over 50 years in captivity.
There are four sub-species of orangutan:
- in Sumatra: pongo abelli
- in Borneo: pongo pygmaeus pygmaeus, pongo pygmaeus wurmbii, pongo pygmaeus morio
- Infant: Birth-to-four years (carried by mother)
- Juvenile: Four-to-eight years (still with mother)
- Early Adolescence: For females, eight-to-15 years and for males, eight-to-13 years
- Sub-adult: 13-to-18 years (males only)
- Adult: For females, 15+ years and for males, 18+ years
The current population of orangutans is less than 60,000 individuals (about 53,000 in Borneo and roughly 6,000 in Sumatra). They are gravely threatened to extinction due to habitat destruction (logging, farming, gold mining) and poaching for the exotic pet trade. When poached, mothers are killed, and if baby survives fall of mother from tree, the baby is taken by poachers.
One of the biggest threats today to orangutans is palm oil. Virgin forests where orangutans live and find all their food are cut down in order to plant the cash crop for palm oil. This oil is widely used in foods and consumers should be aware of ingredients in cookies, ice cream and other foods and not buy products that use palm oil. More threatening now is the use of palm oil in bio fuels. Nearly 5,000 orangutans a year have been killed or died over the past few years as palm oil plantations take up their habitat.