Chimpanzee Sanctuary Northwest
Hope. Love. Home. Sanctuary
If you saw the blog the a couple weeks ago, we got pretty excited because Negra finally went into her cabin! Yesterday Jackie captured a short video of Negra sitting in her cabin. After hanging out in there for a while, she walked around it, stopped to look at Jody through the clear lexan panel, and then sat down next to it with a really sweet and content face.
There are very few jobs that provide as much fulfillment as working for Chimpanzee Sanctuary Northwest. It’s not a stress-free occupation, and there are some heavy issues that we deal with every day, but watching the chimpanzees settle into themselves and their lives at the sanctuary is the most rewarding work I’ve ever done. For me, a lot of that reward and the motivation to get through the stress comes from Negra.
It’s too simple to just say that I love her. I am devoted to her. Each new step she takes fills my heart even more. I mentioned this in my reflections for our 3rd Anniversary blog post, which is fun to read and hard to believe that was almost two years ago! I hope that Negra will be with us for many more years, but you never know what the future will bring. Each moment with her, and with all of the chimpanzees, is precious.
This morning was no exception. Volunteer Connie put out some lettuce on Young’s Hill and served the rest of breakfast in the greenhouse. Once Negra discovered the lettuce (one of her favorite foods) outside, she sat herself down in her cabin and enjoyed the warmth and comfort of the cabin that we named for her while all of the other chimpanzees were in the greenhouse. I didn’t want to get too close with the camera because Negra is at times weary of people taking photos when she’s on the hill, but I did take a few photos from a distance. I hope the photos make you as happy as seeing her out there made me.
A reward for those of you who stayed awake to the end of my last post…some photos of Negra enjoying a forage on the hill this afternoon:
It’s one of the most commonly asked questions about chimpanzees and for most of the last 15 years I’ve been answering it incorrectly. In my defense, I was not alone. Search the internet for “chimpanzee lifespan” and you will often read that chimpanzees live 40-50 years in the wild and 50-60 years in captivity, or something to this effect. This was the standard line when I first started to learn about chimps, but it now appears to be wildly inaccurate. How could this be?
For such a simple question, the answer for many years was difficult to come by. If, for example, you asked, “How long do fruit flies live?” the answer would be cut and dried. Just follow a bunch of fruit flies from birth to death and record their lifespan, which is measured in days. But for a species like the chimpanzee that has only been studied on a large scale for a handful of generations and whose lifespan is measured in decades, good data was hard to come by. Over the years, however, researchers have collected more and more data on captive and wild chimpanzees and a new picture has emerged, one which has drastically changed my own understanding of chimpanzees.
So…how long do chimpanzees really live?
For chimpanzees in captivity, the best information we have is this: For those who survive to their first birthday, median life expectancy is 31.7 years for males and 38.7 years for females. These figures were provided to us by Lincoln Park Zoo’s ChimpDATA as part of a unique program we participated in to help project future demographic trends in sanctuaries, and are based on 35 years of records from Association of Zoos & Aquariums (AZA) institutions.
A couple of technical points, if you’re interested: First, you’ll notice that this excludes infant mortality. If infant deaths were included, life expectancies would be even lower (closer to 32 years for males and females combined, I believe). The reason why infant deaths are excluded is because infancy remains a particularly high-risk period, even in captivity. If we want to know how long a yet-to-be-born chimpanzee might live, we might include it. But most of the time we are trying to determine the expected lifespan of chimpanzees who are already young adults or adults (typical of chimpanzees coming to sanctuaries), who by definition have already beaten the odds of that early high-risk period. Second, these figures are median ages. The way to interpret this is that for a given figure, half of all chimpanzees in that category will die before that age, and half will die after that age. So you would expect to see many chimpanzees live past the median age – in fact, one chimpanzee in the AZA group lived to 72. However, you would also expect an equal number to die before the median age. Finally, we don’t know how different captive environments and life histories affect life expectancy, so it’s possible that future data from sanctuaries will change our understanding of this unique population.
Life expectancy in wild chimpanzees tends to be the same or lower than in captive chimpanzees. One study found that average life expectancy for chimpanzees across five field study sites was only 15 years. But for those chimpanzees who survived to adulthood, which in this study was defined as 12 years old, their life expectancy was an additional 15 years. Of course, many wild chimpanzees live well beyond 27 years – the oldest wild chimpanzee was estimated to be about 63 years old when she died. Direct comparisons between these types of studies can be difficult because they use different methodologies and analyses, but it gives you a rough idea.
The importance of this issue is not just academic – it has the power to shape the way we think about many different aspects of captive chimpanzee care. As we learned through ChimpDATA, information about life expectancy can help us predict future capacity in sanctuaries, as well as the costs associated with caring for a chimpanzee across his or her lifetime. But just as importantly, it can help give us more realistic expectations about the lives of the chimpanzees that we all care for and support.
Today at the end of our staff meeting, Jamie started stomping in the playroom loft. As we’ve figured out, this seems to mean “please put on one of my boots and chase me around the hill.” We thought it would be fun if we ALL played this game with her. As we all started walking out there, Jamie’s hair stood straight on end and she ran so fast out to meet us—she was so excited! It was a lot of fun, and probably the best staff meeting we’ve ever had. I think Jamie would agree.
We’ve had a fun day on Young’s Hill today. JB installed the sign on Negra’s Cabin, and of course Jamie had to inspect JB’s handiwork:
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Finding no problems, Jamie went on to have a great time with good friend Foxie. First they played chase all over the Hill, then they played chase through the cabin panels:
Then Jamie ushered Foxie along a stroll around the Hill:
And when it was time to come in to the greenhouse for lunch, Jamie shared her excitement with a kiss:
We’ve been taken every opportunity with the not-bad weather to spread food over Young’s Hill so the chimpanzees can forage for their meals. They LOVE forages, and it’s nice to see them doing a little bit of what they would do if they lived in the wild. Of course, free-living chimpanzees rely on the bounty of nature to provide their meals. At the sanctuary, the Cle Elum Seven rely on the humans to provide their food. Their food squeaks and full mouths are an indication that we’re doing an okay job.
This morning we spread out a breakfast forage of strawberries, grapefruit, and chow biscuits.
Here’s Jamie collecting strawberries:
Burrito eating some grapefruit while on the move to find more:
Annie and Jamie checking the shakey bridge for food:
Missy found the stash in the cabin:
Annie put an impossible number of chow biscuits in her mouth, then attempted to also eat strawberries:
