Stop castrating gorillas!

Stop castrating gorillas!

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Jane Rasmussen-Dewar hat diese Petition an Neil Bemment (Gorilla EEP coordinator) und gestartet.

European zoos are castrating healthy male gorillas as a management tool. Castration is both unnecessary and cruel, as there are several alternatives - please read on for more information. We believe that the castration of gorillas is wrong, and ask you to take action and sign this petition!

UPDATED:  10Sep19:  A new photo showing the difference between a CASTRATED male and a natural male of the same age has been added here to illustrate what happens when humans mess with a male gorilla's right to grow into the magnificent silverback Nature intended, just because it's *easier* for zoos in the EEP to handle.

RECAP:  The EEP's Castration Policy is NOT necessary or warranted as proven by the SSP's non-castration policy and success with the same issues and population!

UPDATE: 28Sep18: 
 Read details in Original Petition Text under this update.

Our petition helped convince the EEP to (temporarily?) stop castrations since 2016, as they complete a scientific study of the surviving ELEVEN CASTRATED individuals (listed at end of this update).  Since gorillas take 10 to 20 years to mature we were alarmed when we received reliable reports indicating that baby male gorillas were again being identified for possible castrations, so we are updating this petition to let you know captive gorilla lives are still potentially threatened by the very people charged with their protection.  We can stop this, so thanks for signing and sharing this petition!

There seems to be a very big difference in attitudes between the EEP and SSP, the two main advisory boards in charge of each captive gorilla in the professional Zoo World.  The EEP asserts there are only two choices:  (1) castration or (2) killing the “unnecessary” males (by euthanasia and/or selective abortions of male fetuses, the latter which pose great risks to the pregnant females – thankfully neither has happened in gorillas – yet).   Recent media stories quote some as saying castration is an “ethical alternative” – but maiming a healthy ENDANGERED SPECIES makes no sense, especially when the EEP’s North American counterpart (SSP) as well as the largest captive gorilla zoo (England’s Aspinall) successfully manage the same issues without resorting to such barbarism.  See the original petition (below) for several alternatives rendering castration UNNECESSARY and CRUEL. 

Castration (unlike vasectomy) stops/reduces the production of testosterone.  Theoretically it acts like a “lobotomy” of behavior which the EEP believes will enable zoos to keep males in their natal groups, since they won’t mature into the muscular and powerful silverbacks Nature intended them to be.   Initial results show the castrated juveniles are getting along fine, which isn’t surprising since the oldest individual in their study group is only 14 years old and the rest are between 6 and 11 years of age.   However we’re still years away from the critical data to be gleaned when the gorillas reach full maturity.

GOOD NEWS is the EEP has increased birth control and birth intervals and more all male groups are coming online in Europe.  There seems to be a belief that all male groups aren’t as “good” as family groups, but the over-breeding of the past has the EEP finding themselves in a position that is easily avoided in future, if they take advantage of the data and experiences available to them.  All male groups are dynamic, ever-changing and fun to observe.  There are some great successes in zoos like Ouwehands in Rhenen, Netherlands.  Every zoo on the planet wants a family group with adorable gorilla babies to draw in the crowds (and money). Family groups are generally stable with well-known policies when gorilla kids grow up and must leave the group.  All male groups require a higher degree of expertise, exhibit and management flexibility and more patience, but their rewards are just as wonderful.

The EEP makes recommendations to zoos to castrate but zoos do NOT have to do this and many have refused. But refusing to do what your “boss” or “organization” asks of you makes it a challenge for other things, so sadly I fear more zoos will feel pressured to castrate and take the easy way out.  Please contact your local zoo if you’re near one of the zoos where castration has already happened (list at the end of this update) and let them know how you feel.

Meanwhile signing and sharing this petition is getting the attention of the “powers that be” in the EEP and EAZA so thank you all for helping us help give all captive gorillas a chance for the best life possible, while we work on saving their habitat and wild brethren.


NETHERLANDS:  7 castrations – 6 SURVIVING

Castrated by APENHEUL
(1.  KUKUMA   Born 29Sep89  Died 25Feb11 Belfast  at 22 years old)
2.  LOANGO Born 23Dec04   Currently 14 years old at Gaia Zoo
3.  JABARI   Born 22Dec12   Currently 6 years old
Castrated by GAIA ZOO
1. MOSI Born 10Feb10   Currently 8 years old.
Castrated by AMSTERDAM
1. BEMBOSI Born 31May11   Currently 7 years old
2. SHAMBE   Born 04Sep11   Currently 7 years old
3. DOULI   Born 27Feb12    Currently 6 years old

 FRANCE:  3 castrations

1.  D’JOMO Born 16Sep08   Currently 11 years old.
2.  MAWETE Born 20Nov11   Currently 7 years old.
Castrated by BEAUVAL
1. MAPENZI Born 14Apr10   Currently 8 years old.
ENGLAND:  2 castrations
Castrated by CHESSINGTON
1.   M’BULA Born 10Mar09   Currently 9 years old.
2.   M’WANA Born 23Feb12   Currently 6 years old.

+++ News: Please read Neil Bemment's reply (in the News section further below on this page) that has some promising statements. However, they are not very precise and therefore raise more questions that I am addressing in my own reply. +++



In the wild gorillas live in family groups with one dominant silverback (adult male). When a young male matures he often leaves his natal group and lives alone or with other males until he gets his own group with females who leave their families. Adult males can live together in breeding and non-breeding groups with changing hierarchies over time, but not every silverback successfully breeds.

The Problem:

Zoos try to mimic the wild but cannot. Poor breeding policies have created too many gorillas related to too many others. Female gorillas are easier to manage than silverbacks, however, so there is a problem with “surplus males”. Castration not only “fixes” the problem of unwanted breeding but also changes the physical and psychological make up of the gorilla, making them easier to manage than a healthy silverback. It is comparable to lobotomies on problem humans of the past, used to change behavior. Herein lies the issue. The EEP opts for the cheaper/easier solution for the zoos, not the gorillas.

For instance, one zoo let breeding go unchecked and had six baby boys in five years. Recently two of those babies were maimed for life when they were castrated, with a third baby possibly awaiting the same fate.  

The Paradox:

Gorillas are an endangered species. Millions are spent to save them in the wild while we cruelly maim them in our zoos, allegedly for the sake of conserving their species. Brought into captivity and bred by us they deserve the best life possible. They are not a "sack of genetic material", as apparently considered by some officials, but unique individuals to whom we owe our respect.

The Science:

As of today, the EEP bases its “science” on the appropriateness of castration on just one gorilla. Kukuma (photo) was castrated as a youngster in the early 1990s, in an experiment to see if a castrated male “not needed for breeding” could live in a family group. He died at the early age of 21.

There are no scientific studies done on castrated gorillas, but there is a wealth of data on the negative effects castration has on humans and other primates including mood changes, depression, gradual bone-density loss resulting in osteoporosis, weight gain as well as severe heart problems. Someone who has met three adult castrated gorillas described them as “like powerful athletes ravaged by disease, looking more like old lady gorillas without the sagittal crest or muscular chests and limbs like the magnificent silverbacks they were meant to be.”

Different Attitudes:

Two scientific zoo committees are in charge of all captive gorillas:

— SSP: North America, with approximately 344 gorillas in 54 zoos
— EEP: Europe and the rest of the world, with approx. 429 gorillas in 62 zoos

Castration is only being done by the EEP. The SSP does not use castrations despite having the same challenges before them. It has had a strict breeding policy in place for decades, wanting to maintain and stabilize their population, whereas the EEP wants to increase their numbers so breeding continues. Gorilla babies are important to the group, but not every gorilla needs to have countless babies as some have done in the EEP. For instance, Zurich’s silverback N’Gola has had 34 offspring, Bongo at Apenheul 24, and the female Lobo at Apenheul 11 so far.

Both the SSP and EEP have added several zoos with all-male groups which is a step in the right direction, but it’s more challenging. Some zoo directors prefer having baby gorillas to get more visitors (and more money) and they erroneously believe all-male groups aren’t good for the gorillas or the visitors. One zoo director said he would rather have a castrated gorilla living in his natal group than living in an all-male group, clearly not understanding/recognizing the wealth of social interactions all-male groups have, and how successful they can be given the confines of captivity itself. Many in favor of castration say euthanasia is the only alternative, which is simply not true.

Viable Alternatives to Castration:

As the SSP has shown, castrations are not necessary and can be avoided by

  • careful and strict breeding restrictions / recommendations
  • establishing all-male groups in more zoos
  • sending young males to be with lone gorillas in other zoos
  • returning gorillas to protected areas in Africa, like the Aspinall Foundation has successfully done
  • more “commerce” between the SSP and EEP zoos
  • fission/fusion groups, where breeding females spend time with different silverbacks, a relatively new trend which shows promise


Help us Help Gorillas

We are not anti-zoo, but history shows us that zoos don’t always do what’s best for the animals until time and public pressure convince them to change. We believe that the castration of gorillas is wrong, and ask you to take action and sign this petition! With your help, we want to tell EEP and EAZA (the umbrella organisation) to stop this cruel practice and to focus on the available alternatives.

We ask that no more gorillas be castrated at least until the 10 already maimed in Europe can be scientifically and properly studied. There is a lot of information on all-male groups but little to none on the effects of castration on gorillas. If we can’t get zoos to stop castrations altogether, at least they should have respectable science supporting their decisions!


Initiated by:

Esmay van Strien, Amsterdam, The Netherlands
Jörg Feiertag, Graz, Austria
Jane Rasmussen-Dewar, Morganton, United States

 For more information, or if you have questions, please contact Jane.

And here is Dawn Forsythe's statement on this issue, shedding more light on the different attitudes of the EEP and SSP.

0 haben unterschrieben. Nächstes Ziel: 75.000.
Bei 75.000 Unterschriften wird diese Petition zu einer der meist gezeichneten Petitionen auf!