#zoos

Sign literally 10 feet away:

I didn't know this, but I just found out that the Philadelphia Zoo has a network of animal walkways to allow their animals to roam around the zoo! They call it "Zoo360" and honestly it looks pretty cool.

This is Tandie, the current male lion at the Woodland Park Zoo.

Notice anything odd about him? He's got one of those hilarious awkward teenager manes. Except... this cat is nine years old.

I was, of course, immediately curious.

Manes serve a lot of purposes for male lions, including being an indicator of health and fitness - it's actually a sexually selected trait and a social signal. Mane texture / hair quality / length is dependent on nutrition and the body having energy to grow (and carry around!) that much hair! The color is also a signal: males with darker manes have been found to have higher testosterone levels.

In one research report, wild males were much more likely to avoid a lion decoy when it had a longer or darker mane - but the girls really loved a dark mane. It's thought this is because a long, dark mane is an indicator of mate quality. Males with longer, darker manes have higher testosterone and were pretty healthy: meaning they had more energy for fighting, had a better chance of recovering if they got injured, and generally had a higher rate of offspring survival. Manes matter!

So, back to Tandie. He was actually born at the Woodland Park Zoo in 2014 alongside two brothers, to dad Xerxes and mother Adia.

This was Xerxes (rip).

Obviously, a very large, dark, lush mane on Xerxes here. So where did these blond muttonchops come from on his son?

I asked the zoo docents and got an answer that didn't make a lot of sense. They told me that after the three cubs grew into adolescents, they were moved to the Oakland Zoo together. But living together suppressed his testosterone, and he never grew a mane.

Hmmmm.

Here's a photo from 2016, when the brothers debuted at Oakland. They're a year and a half old in this photo.

(Photo Credit: Oakland Zoo)

And here's from an announcement for their third birthday.

(Photo credit: Oakland Zoo)

Okay, so these dudes obviously all were growing manes as of 2017. I think Tandie is the one on the left in the first photo, and laying down in the middle on the second. What happened?

I was just in the Bay Area for a zoo road trip, of course I went to Oakland and tracked down a docent to ask some questions.

It turns out that shortly after the brothers turned three, they started acting like adult male lions: they started scuffling regularly. It's a normal social thing for male lions to live in groups, called coalitions, but according to my lion experts there's generally a baseline level of some social jostling within them. It wasn't quite clear from what the docent said if they couldn't manage the boys together, or if they just wanted to avoid the scratches and small wounds that result from normal lion behavior. Regardless, they put all three of the boys on testosterone blockers in order to be able to keep them together as a social group.

Now, I don't know a lot about the use of hormone alteration as a form of captive animal management, except in the case of birth control. I don't think it's something that's unethical - there was just a webinar on it that I saw go by - but I don't think it's commonly done with big cats. Lions have kind of complicated reproductive cycles, and for instance, we've been learning that female lions can take much longer to come into estrus again than expected after coming off hormonal birth control.

In males, testosterone blockers (or being neutered) means they lose their manes. This is why a lot of rescues will do a vasectomy on their males instead of a neuter - it allows them to keep their mane and the social signals that accompany it.

Tandie returned home to Woodland Park Zoo after Xerxes passed in early 2022, and the docent told me all of the lions had been off their blockers "for while." I'd guess those things happened around the same time, since bringing the trio down to a duo at Oakland would reduce some of the social tensions.

Hormones are such interesting things, though. One of Tandie's brothers has a full mane again, and the other is still totally mane-less.

As for Tandie, his mane is growing back in, and it looks like he might rival his dad for length and coloration.

He started here, in February:

Yesterday:

"In one of Africa’s last great wildernesses, a remarkable thing has happened—the scimitar-horned oryx, once declared extinct in the wild, is now classified only as endangered.

It’s the first time the International Union for the Conservation of Nature (IUCN), the world’s largest conservation organization, has ever moved a species on its Red List from ‘Extinct in the Wild’ to ‘Endangered.’

The recovery was down to the conservation work of zoos around the world, but also from game breeders in the Texas hill country, who kept the oryx alive while the governments of Abu Dhabi and Chad worked together on a reintroduction program.

Chad... ranks second-lowest on the UN Development Index. Nevertheless, it is within this North African country that can be found the Ouadi Rimé-Ouadi Achim Faunal Reserve, a piece of protected desert and savannah the size of Scotland—around 30,000 square miles, or 10 times the size of Yellowstone.

At a workshop in Chad’s capital of N’Djamena, in 2012, Environment Abu Dhabi, the government of Chad, the Sahara Conservation Fund, and the Zoological Society of London, all secured the support of local landowners and nomadic herders for the reintroduction of the scimitar-horned oryx to the reserve.

Environment Abu Dhabi started the project, assembling captive animals from zoos and private collections the world over to ensure genetic diversity. In March 2016, the first 21 animals from this “world herd” were released over time into a fenced-off part of the reserve where they could acclimatize. Ranging over 30 miles, one female gave birth—the first oryx born into its once-native habitat in over three decades.

In late January 2017, 14 more animals were flown to the reserve in Chad from Abu Dhabi.

In 2022, the rewilded species was officially assessed by the IUCN’s Red List, and determined them to be just ‘Endangered,’ and not ‘Critically Endangered,’ with a population of between 140 and 160 individuals that was increasing, not decreasing.

It’s a tremendous achievement of international scientific and governmental collaboration and a sign that zoological efforts to breed endangered and even extinct animals in captivity can truly work if suitable habitat remains for them to return to."

Something Exciting Developing at the Sedgewick County Zoo: Imperiled Salamanders!!!

The Tokyo Salamander (Hynobius tokyoensis) is listed as Vulnerable by the IUCN, with populations declining in the wild. Native to Japan, this primitive amphibian prefers temperate forests near rice paddies, streams, and ditches - places it depends on for breeding. Rather than laying individual eggs like many salamanders, Tokyo salamanders produce a single elongated egg sac, where dozens of eggs develop together inside a protective, jelly-like tube. It’s one of their most distinctive traits, and we are currently fortunate enough to be observing this process here at Sedgwick County Zoo. As the embryos grow, they’ll hatch into aquatic larvae with external gills. Over time, they’ll undergo metamorphosis, losing their gills and transitioning to life on land, returning to water primarily for feeding and reproduction. While this species is not on exhibit, three of the five total Tokyo salamanders in AZA care live here behind the scenes, helping sustain the population of this species. Follow along as these eggs develop! We will be working to share updates as they grow.

via: Sedgwick County Zoo