Learning

August 05, 2008

We're back! We're starving!

In the summer wildfires, what would the condors do? When flames and smoke tore through their Ventana Wilderness sanctuary, how many would survive?

These California condors were raised in captivity. Some grew up in large aviaries with two-parent families, and others were fed by condor puppets and raised in condor playgroups (most unnatural for a species in which every child is an only child and neighbors never drop by for a cup of carrion). All were introduced into the wild without the benefits of the ancient condor culture, passing through release pens, decked with electronic transmitters, monitored by worried biologists.

When fire hit, the Coast Guard airlifted out seven teenaged birds and their guidance counselor (a somewhat older and more experienced bird) who were in an aviary on the sanctuary awaiting release. But 43 birds were on the loose, and no one knew how they were doing. Nor could the biologists get in to the sanctuary. Usually the birds' wild food is supplemented by government handouts of roadkilled deer and stillborn calves, but in this time of trial they had to go without. (They get dead rats too. For all I know they get government cheese.)

No venison, no beef? No worries. Instead of sticking around and hosing down their homes in a desperate attempt to save their dwellings, the condors went to the coast and had the seafood platter. They flew to Big Sur and lunched on a decayed sea lion and a dead whale. They didn't go home until the fires were out and the yellow tape was down.

They knew the terrain, because this wasn't the first time they'd been to the coast. The sanctuary is inland, but ever since the condors were reintroduced, “we noticed the birds starting to really home in on the coast more and more,” senior biologist Joe Burnett said recently at the SF Zoo. “We didn't realize the historical significance of it till we started looking thorough the notes.” There hadn't been condors in Big Sur for more than a hundred years.

The excellent to-hell-with-this-let's-go-to-the-beach survival tactics adopted by these condors show the value of exploration. These birds knew their options.

If you are ever basking on a sandy beach, or lying on the cliff at Esalen, and you are lucky enough to see a condor drifting above, looking down at you thoughtfully, think of this inspirational tale. Do not focus on the idea that a giant vulture has you in its sights. Remember, they only eat dead things. Be supportive; be safe. Wave!

June 01, 2008

A Bird for Each Shoulder

Sometimes people get sentimental about the nobility of animals. But it depends on the animal. Perhaps you saw the story of Yosuke, a pet African Grey parrot in Japan. One day he got out. As parrots do, he flew around for a few days and a few miles before landing and seeking human help. (“Free! I'm free! I can go anywhere I want! I fly, I soar! -- Hey, where am I? Where is everybody? Where's lunch? Oh no! Lost! I'm lost!)

The police picked up the bird, and an officer tried to chat, but the parrot wouldn't speak. He was deposited at a vet clinic, and after a while he opened up. “I'm Mr. Yosuke Nakamura,” he confided. He gave his address. The vet told the police, who found that yes, there was a Nakamura family at that address who had lost their bird. They said they'd been drilling Yosuke for two years on how to ID himself. (Smart. I never even thought of teaching my cockatiel, “I'm Ms. Beak-of-Steel McCarthy.”)

Mr. Nakamura contrasts with the last talking bird I read about in the news, a blue-and-gold macaw at a wildlife sanctuary in Warwickshire. Barney, formerly a lorry-driver's pet, is a classically foul-mouthed parrot who is no longer allowed to meet the public after telling “the local mayoress to f*** off.” He cursed some children. He cursed the vicar. Like Yosuke, he doesn't trust law enforcement, and told two police officers, “You can f*** off too, w******!”

Those asterisks were in the original. I am a simple natural history buff and can only guess what they stand for.

Two African Greys at the sanctuary have picked up these effective phrases from Barney. The Daily Mail reported that sanctuary owner Geoff Grewcock says the three birds sit around swearing. “It sounds like a builder's yard, with all the abuse flying about.” A fourth bird, Sunny, shrieks “Shut up!” when the cursing starts, but they ignore him.

According to the Sun, Grewcock hopes to clean up Barney's conversation by making him listen to documentaries and “posh Radio 4.” As a simple American, I can't even guess what that means Barney will be saying next.

The contrast between nasty rowdy Barney and articulate well-informed Mr. Yosuke Nakamura reminds me of a dog encounter I witnessed. On Market Street in San Francisco, a woman with a white cane was led along the sidewalk by a guide dog, a golden lab. They were near the curb when a pickup truck pulled up at a red light. Two dogs in the back of the truck glanced down, saw a dog below, and instantly began barking loudly. (“Hey! A******! Get away from our truck! Back off, flea-bus!”)

The startled guide dog, suddenly assaulted by hostile sound from above, shrank in terror. The woman with the cane knelt and put her arms around him as the dogs in the truck kept yelling. The driver of the truck looked back, saw what her dogs were doing, and started frantically banging on the back window, yelling at them to stop. Her dogs, encouraged that she was joining the ruckus, barked even harder. (They could have used a bird like Barney to ride shotgun.) Finally the light changed and the truck drove away.

The hard-working guide dog, who had devoted his life to service, stood on the sidewalk trembling. The idlers in the truck, loudmouth jerks who threatened others for the fun of it, zoomed off into the West, probably congratulating each other on effective pack-work and flinging beer bottles into the gutters.

It was a moral scene suitable for a Hogarth engraving. (Okay, I know, like I spend so much time looking at engravings. It would be perfect for Goofus and Gallant.)

April 23, 2008

The Dangerous Lives of Treeshrews

I was reading Tupai: A Field Study of Bornean Treeshrews by Louise H. Emmons because that is the kind of thing I like, and learned about the absentee maternal system found in some treeshrew species.

First I should say that treeshrews are the same as tree shrews, and the closing up of the word is probably meant to indicate that they don't really live in trees and they're not really shrews. This is a case of TC, Taxonomic Correctness, like the argument that you should call a starfish a sea star because it's not really a fish. Oh please. But a big issue about treeshrews is whether they're descended from very primitive primates and so are our distant cousins, or whether the connection goes further back so that the primates and the treeshrews are both descended from the clade Euarchonta, making them even more distant cousins. I have no opinion on this.

In the absentee maternal system the mother treeshrew builds two nests (yeah, in trees). They are far apart. She puts her babies in one and she sleeps in the other one when she's not racing around snuffling through the leaf litter and catching bugs. Every other day she secretly visits the babies, taking a different route each time, and nurses them. When she's not there the babies lie still and don't make a sound. If an intrepid wildlife biologist like Louise H. Emmons takes a baby out of the nest, it lies silently in her hand with its eyes closed.

One day when they are old enough the mother treeshrew drops by as usual, but instead of just nursing them she takes them out and shows them Borneo. Here's a bug, here's a little trail, here's what you do when you hear a scary noise -- there's another bug! Let me see you grab it! She brings them with her on her rounds and protects them while they learn the business of treeshrewing.

According to a report from the wild, the babies were "shaky" the first time they came out of the nest hole.

The reason treeshrews do this has to be that it makes it much less likely that predators will find the nest and eat the babies by observing the mother. (That's the sort of creepy trick that jays and crows do, for example.) And obviously it's very convenient for the mother treeshrew. Which makes me lean toward the idea that treeshrews aren't primates – what baby primate holds that still for that long?

Tupaia_tana_j_smit

Like other wildlife biologists who write books for general audiences, Louise H. Emmons tries to find a balance between the stuff working scientists mostly do, and the stuff that people are actually interested in hearing about. Most of the work of wildlife biology doesn't involve playing peekaboo with baby gorillas, swimming with whale sharks, or filming hippo hijinks. It involves data sets. Perhaps Emmons leans too far in the direction of hard science, because her best story was walled up alive in an appendix. (I read appendices so you don't have to. Or at least I skim them.)

In Appendix 1, Emmons explains why a trapping data set is incomplete.

In the January trapping period, a group of elephants went through the study area, systematically destroying man-made objects (rain gauges, signs, trail markers, etc.). They stomped on seven baited traps but interestingly did not step on one that contained a treeshrew, while flattening the two on each side (trapping in January was curtailed, and this month is excluded from most data).

The elephants spared the tiny prisoner! Of course I think they did it because they felt compassion for the treeshrew, but I realize that there is also a compelling quality to  the explanation that they did it because they didn't want to get their feet sticky.

April 10, 2008

Behold this child

Oh_my_bigish_file_3



My sister took this photograph. It shows Sky, a Thoroughbred mare, and her first foal. The foal's about 5 minutes old.

Because it was her first foal, Sky had no idea what was happening when she went into labor. First she felt bad, and then she felt really bad, and it hurt a lot, and it went on and on. That's a big foal, and labor was difficult. The foal got stuck twice, even with two people pulling on it.

In the picture, Sky is astonished and thrilled. A baby! There's a baby! It's her baby! Sky, like a lot of mares, always liked foals, but could never get her hands on one, so to speak. Their mothers wouldn't let other mares near them until they were older.

My sister, Dr. Sarah McCarthy, is an equine veterinarian, and she helped me decode Sky's expression. That wide eye means just what you think. It's true Sky's glancing at the camera, but that's not why her eye's so big. She's wide-eyed with amazement. A child of her own has magically appeared in front of her (and just as she was getting over the worst colic ever). As described in Becoming A Tiger, some first-time mare mothers have been known to get up from the straw and walk away, not having any idea that there's a baby horse in the vicinity. My sister knows of cases where a mare has to be grabbed as she walks away, led back, and shown the foal she'd just given birth to. Wow! Look, a baby! Wow!

Sky's ears are straight up, which shows excitement and attention. Her neck is stretched out in eagerness. Also, and this is harder for a non-horse person like me to notice, Sky's lips are protruded and her nostrils are flared, as she drinks in the delightful smell of her new child. She's beside herself with joy and surprise.

I met Sky's chestnut filly when she was 5 days old, racing around, doing little kicks and leaps, followed every moment by the still rapturous but much calmer Sky.

Next time Sky goes into labor, she may suspect what's coming. My sister tells me that Rosie, one of her other horses, had definitely figured it out by the time of her 3rd foal. Alerted by a 3 a.m. phone call that Rosie's water had broken, she went down to the stall. As soon as Rosie saw my sister she began to nicker tenderly as a mare does to a foal. It was as if a woman in labor greeted her obstetrician's arrival by saying, “Oh, who's the best little baby in the world?”

[This photograph is copyright by Sarah McCarthy and may not be used without her permission. You may not, for example, put it up on a LOL cats site, with the horse on the left captioned I CAN HAZ FOAL? and the horse on the right captioned CALL ME CHEEZBURGER.]