Posts Tagged ‘gorilla’

From the BBC:

Zoo biologists use genetic analysis, demographic statistics and keen familiarity to plan the sex lives of their charges. Their goal is to avoid inbreeding and produce healthy offspring, but sometimes, even the best scientists and most attentive zoo-keepers cannot prevent a tragedy.

The couple seemed like a good pair.

Already sporting a distinguished coat of grey fur at the age of 22, he was a stout, hale and hearty father of a young son.

She was a bit younger – 16 – but those who knew her thought she was ready for motherhood.

And crucially, the computer analysis showed they did not share any recent ancestors, making them a good genetic match.

So, in a Chicago love story, zoo-keepers brought together Kwan, a male silverback western lowland gorilla, and Bana, a demure female. They hit it off, and on 16 November, Bana gave birth to a healthy baby girl.

“Kwan did a really great job,” said Maureen Leahy, curator of primates at the Lincoln Park Zoo in Chicago, in an interview shortly before the birth.

“This romance and match has actually paid off.”

The pairing of Kwan and Bana was the product of a sophisticated breeding plan devised by a team of biologists to ensure the future genetic health of the US gorilla population.

The western lowland gorillas are just one of more than 300 species of animals in zoos across the US whose sex lives are carefully managed by the Population Management Center at the Lincoln Park Zoo.

Species specialists play matchmaker to anteaters, okapis, hyacinth macaws and many others, with more than 80,000 individual critters subject to their plans.

It’s similar to internet dating, said Sarah Long, the centre’s director.

“We use computers and databases to get a male and female together – and sometimes produce offspring,” she said.

“We’re not getting new founders… wild-born animals. Now zoos are more focused on preserving what we have.”

The computer software they use weighs the pedigree of the males and females, in some cases all the way back to the wild, to determine whether they are a good genetic match.

Ideally, they want two animals whose ancestors’ genes are scarce among the population – that is, they have few relatives living in US zoos.

Other factors include the ages of the possible mates and the distance between them, and whether a zoo has the resources to feed and care for another one.

“We’ll look at that giraffe’s age. Is she valuable or not?” Ms Long said.

“Do we want her to breed? Is she the reproductive age? Is there a male out there who she could breed with that’s equally valuable? Is he the right age?”

Last year, Bana was living at a zoo in Brookfield, Illinois, about 20 miles away.

Fifty-two zoos across the country held 342 western lowland gorillas.

But Kwan was sexually and socially mature – and nearby.

The zoo keepers thought Bana would fit into the “sisterhood” of female gorillas already living with Kwan and his six-year-old son Amare.

With the match made, Bana arrived at the Lincoln Park Zoo in a climate-controlled van.

She and Kwan were introduced and a flirtation commenced, with Bana staring longingly at Kwan, throwing him her bedroom eyes for as much as an hour at a time.

“We actually kept her on oral contraceptives to make sure that she was socially established within the group before she got pregnant,” she said.

Even while she was on the pill, she would go into heat and the pair would “solicit each other for breeding”, Ms Leahy said.

Meanwhile, Bana settled into her role as a low-ranking female in the social group. That often meant keeping her distance from Kwan, who as the silverback stood at the top of the social hierarchy.

Eventually, the zoo-keepers decided Bana was ready to be a mum and took her off the pill.

After the infant was born, she thrived and met her milestones for growth, and Bana quickly learned to nurse.

Her social status rose, and she began to eat together with Kwan, who recognised the infant as his own and protected her when other gorillas played nearby.

Even the other juvenile gorillas were curious about the new arrival, Ms Leahy said.

But then, early on the morning of 25 November, zoo-keepers noticed the infant appeared listless in Bana’s arms, and soon after, they realised she had died in the night.

A subsequent investigation shows she perished of a skull fracture, but zoo-keepers are adamant she did not suffer violence.

A necropsy showed no other wounds, no pulled-out hair, no scratches or bruises, and the infant was otherwise completely healthy.

“This was very accidental,” Ms Leahy said.

And Ms Leahy says the infant’s death does nothing to make the population planners think Bana’s match with Kwan was made in error.

“Bana was demonstrating completely appropriate mothering behaviour and the social group itself was demonstrating completely appropriate behaviour [toward] a new infant,” she said, “those were marks of success, in my book.”

For now, the gorillas seem to be in mourning.

“The group as a whole definitely recognised the loss of this infant,” Ms Leahy said.

“There was a lot of gentle nuzzling and touching [from] some of the females that wouldn’t otherwise necessarily interact with Bana. The whole group really attended to her for several days after the infant was gone. Behaviourally, the group was a bit subdued.”

Kwan and Bana have been spending time together, and Ms Leahy hopes the story will have a happy ending.

“We will continue to maintain her breeding recommendation,” she said. In other words: “We’re going to continue to let nature take its course.”

Most of the animals kept in zoos– even those that aren’t endangered in the wild– have issues with genetic diversity.

Even with animals that have proven relatively easy to breed in captivity, pnly certain percentage of wild-caught individuals will breed in captivity.

Being able to breed in captivity is a major selection pressure on zoo animals, and it certainly was a major selection pressure on the animals we domesticated.

To complicate matters even more, many species that are kept in captivity are derived from a very small founding population. There are often just a few lines of different species that are held worldwide.

That means that zoos have to work hard to maintain healthy populations.

As a population, domestic dogs have a lot of genetic diversity, but dog breeders and the institutionalized dog fancy have decided to squander as much of it as possible.

Could you imagine what would happen if zoos got into breeding animals for competition?

It would be a disaster.

You’ll note that zoos work together to maintain genetic diversity.

The dog fancy is far from that collaborative.

Yes, breeders will work together, but the system rewards individual achievement.

One gets rewarded for having the best conformed dog or the one that has produced the most champion.

You don’t get rewards for having the healthiest, most genetically sustainable breeds.

In fact, you wouldn’t be able to get rewarded. It would have to be a collective effort that was sustained over many decades.

That’s so boring.

And you can’t make a game out of it.


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Why does he walk upright?

So he can carry things.

Which is the same reason why many scientists think our ancestors evolved bipedalism.

Bipedalism frees up the ape’s hands and allow the ape the ability to craft tools.

Our ancestors would have had to have had a major selection pressure for tool use and for the ability to carry things long distance for this form of locomotion to have evolved in our species. It is a very inefficient way of moving. We can’t run all that fast, and as we age, we have joint and muscle issues. We are not a very “well-designed” animal at all.

But if we weren’t upright walkers, we couldn’t carry things very well.


By the way, Ambam is not the first captive ape to adopt bipedalism. A chimp named Oliver became famous for his upright walking, and it was claimed that he was a humanzee, a hybrid between a human and chimp. When his DNA results came back, he was found to be fully chimp.


Humans and chimps probably can produce hybrid offspring, but to create such an animal would have major ethical ramifications.

The Soviet Union under Stalin funded a program to produce human/ape hybrids. In the West, this often gets reported that Stalin wanted to create a force of super-human soldiers to unleash upon the world.  They could really “spread the revolution” with an army of genetically engineered soldiers– so the story goes.

In reality, Stalin didn’t much care for the experiments, which were actually designed to prove Darwin’s theory of evolution to the still quite religious peoples of the Soviet Union. Of course, Stalin eventually backed Lysenkoism, a type  of Lamarckian theory of inheritance, and without Mendelian genetics, Darwin was negated. Followers of Mendelian genetics lost their jobs, and some were imprisoned and even killed for refusing to accept Lysenkoism. (Among these Mendelians who lost their prominent positions was Dmitri Belyaev. You know, the fox farm guy.)

But that story isn’t nearly as cool as the legend that Stalin had plan to bring about the real planet of the apes.

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Basically, the gorillas are descended from the ancient African apes that became cows, eating little else but vegetation and breeding in harems.

Humans are derived from that ancient African apes that became wolves, hunting large prey species with our refined tools (the result of our unusually large brains) and (usually) breeding in social units that were based upon a pair bond.

Both gorilla species (Eastern and Western) are quite threatened with extinction. The mountain gorilla subspecies of the Eastern gorilla is critically endangered.

Humans have taken over the world, and we like to think that our technology removes us from nature. And it does to certain extent. But we are still part of nature. It is a mere delusion of technological advancement that we have removed ourselves from it entirely.

As an aside: Isn’t it hard to deny evolution when you look at a gorilla’s eyes?

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Koko and All Ball


This is sad.

But she did get another kitten.

And named him Lips-Lipstick.

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Koko and All Ball


This is sad.

But she did get another kitten.

And named him Lips-Lipstick.

Read Full Post »

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