Help Name The Prospect Park Zoo Baby Baboons

Congratulations to Bole for being the father to two healthy and beautiful babies! Born on July 23rd and July 28th respectively, these two babies are a bundle of joy for mothers Kaia and Rebecca. The last time Prospect Park Zoo had a baboon birth was 6 years ago, a male baboon named Kito to mother Matara and father Simen.

Kaia and Rebecca (both 7 years old) were sent from Bucknell University to breed with Bole, a longtime resident of the hamadryas baboon exhibit at Prospect Park Zoo. For now, the babies are referred to #1 and #2 but that will change come September 24th. Prospect Park Zoo is asking you to submit names for these two fur balls no later than September 21st. Then, on September 24th, the zoo will announce the winning names. To suggest names, please visit Prospect Park Zoo's website here.

Photographs by Julie Larsen Maher ©WCS

Baby hamadryas baboons are born with black fur (pelage). As they mature, their fur changes from black to olive brown. Adult hamadryas baboons are grayish (males) or brownish (females). Hamadryas baboons were once considered sacred by the ancient Egyptians because these baboons were the attendant of the god Thoth.

Personally, the birth announcement was an exciting news because I've come to "know" Bole after spending almost a year observing him at Prospect Park Zoo. The 18 year-old Bole were especially closed to one of his three females, Zula. Together with Zula, Bole can been seen obsessively grooming each other up to the point where both of them had bare patches of skin. That, my friend, is one extreme PDA!

Without a doubt, the introduction of Kaia and Rebecca into Bole's group will change the troop's dynamics but I am very curious to see what the changes are to Bole's group. What will happen with the relationship between Bole and his three original females (Zula, Mekele and Kobo)? My recent observations suggest that Mekele and Kobo had moved from Bole's group into Simen's group. While I probably won't know the exact reasons why they would do so, I'm guessing that these lower ranking females are joining a much more dominant group for better access to food resources (higher ranking members get access to more preferable pieces of fruit, etc.).

Read more about the baby baboon here.

Macaques and Their "Pet" Kittens

Do you remember a post last month on pet keeping in animals? If you don't remember or never read it, here's the link (Do animals keep pets?). I just received a link from a friend of mine (Thanks Kristen!) about a long tailed macaque adopting a kitten in Ubud, a town in Bali, Indonesia. Below is a YouTube video of said macaque with his "pet" kitten taken in 2008. Read more about this story on Treehugger and on Telegraph.

There is also another "documented" incident of a macaque adopting a kitten in the city of Jhansi, India. This video was taken in 2007.

Do you think that these two incidents provide enough evidence that animals (primates) are capable of pet-keeping? Or is this merely nurturing instinct that is hardwired into some animals? Again, what is your take on pet-keeping and how would you define it? Are pet-keeping unique to humans? 
In a glance, I personally think that these two incidents merely shows a more nurturing side of the macaques than pet-keeping. Although, since this is not a longitudinal study, I can't extrapolate much from a few minutes of footage. What do you think? 
And to end this post, here's a gratuitous picture of a nurturing primate and his pet kitten.

Wordless Wednesday

The Menstruation Story

In keeping with yesterday's post on sexual maturation, here's an interesting find from YouTube. The Menstruation Story was produced by Disney circa 1946. Quite an interesting video, I might say. With interesting take on the video by Shameless and NYmag.

Having Brothers Delays Menstruation and Sexual Activity in Sisters

Hey girls, your brother will not only pull out your Barbie's head but he will also delay your sexual maturation as well ... allegedly. A interesting study by two behavioral ecologists (Milne & Judge, 2010) on contemporary western society of Australian adults found that:

Girls with older brothers experience a delay in menstruation.
Girls with older brothers (but with no older sisters) started their menstruation at a mean age of 13.6 years while girls with older brothers and older sisters started their menstruation at a mean age of 13.3 years. Girls with no older brothers (with or without older sisters) started their menstruation at a mean age of 12.7 years. The more older brothers the girls had, the older they were when they started their periods. However, the age of the brothers does not effect the results.

Girls with younger brothers experienced a delay in first sexual activity.
Girls with one or more younger brothers experienced their first sexual activity up to two years later than girls without any younger brothers.

Neither younger nor older brothers influenced the fitness of their sisters. 
Brothers do not affects number of pregnancies, number of children, age at first pregnancy or the firstborn of their sisters.

It is thought that having boys in subsistence and preindustrial societies require more resources than girls, therefore imposing a constraint on lifetime reproductive success. Results from Milne & Judge (2010) were unusual for a society that has plenty of resources because it shows evidence that having brothers negatively affect their sister's sexual maturation. However, having brothers do not influence the reproductive fitness of their sisters. The authors posit that brothers in contemporary Australian are not associated with reproductive fitness due to their sisters having a long period of independence before child bearing. Dr. Judge said that she prefer not to speculate too much of the study as the study was very basic and straightforward. She emphasized that the delay in sexual maturation should not be interpreted as something negative.

Possible reason why younger sisters are experiencing a delay in first sexual activity.

Important to note that the study interviewed only 273 (n) adults between the age of 18 - 75. Out of the total 197 are females and 76 are men. It would be interesting to see results of the study from a bigger sample size because the study essentially represents the western society of Australia (N) as a whole, so the sample size (n) should be bigger. I don't know off hand the population size of western society of Australia, but the Australian population is currently 22,434,156 (current as of August 24, 2010 from Australian Bureau of Statistics). So I would be interested to see if the trend holds up to a bigger sample size, where (n) is at least over 1000. Also, would sisters of twins (with younger twin brother or older twin brother) exhibit the same delay in sexual maturation as well?

References:
Milne, F.H. Judge, D.S. 2010. Brothers delay menarche and the onset of sexual activity in their sisters. Proceedings of The Royal Society B DOI: 10.1098/rspb.2010.1377

Edwards, L. 2010. Having brothers delays sexual maturation in women. Physorg.com Retrieved August 23, 2010 http://www.physorg.com/news201419637.html