Posts Tagged ‘Animals’

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Who made a saguaro hole in one?

March 26, 2017

Out in the desert, you may hear a loud “Chirrr” sound. Look up, and you may see a flash of black and white wings, then see a brown-headed individual running or hopping up the trunk of a tree, if there are any trees around, or a cactus. If it’s a cactus, that’s got to be a fairly death-defying move, navigating among the thorns.

When you see all of these clues together in southern Arizona or northwestern Mexico, it’s quite likely you have spotted a Gila Woodpecker.

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You can recognise Gila Woodpeckers, Melanerpes uropygialis, both male and female birds, from the thin vivid black and white bars across their wings and back, and their brown heads. In addition, the male has a red patch on his forehead. And, as well as their distinctive “Chirrr” call, they also make loud peeps.

In an unusual and clever tactic, they use their tails to prop them up vertically as they locomote, hunting for insect meals on bark or cactus skin, or when they hammer out nests.

The big black holes you see in the sides of many saguaros? Credit goes to these folks!

They use their strong beaks on their well-cushioned heads to whack nest holes into the sides of saguaro cacti, and if they can find any, other tall woody plants of the desert, including cottonwoods.

The nest holes they excavate in saguaros, which are often used by other birds, eventually harden into “saguaro boots.” These woody, rounded, boot-shaped forms remain even after the saguaro dies, and have been used as containers by humans since the olden days.

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The fog comes.

January 23, 2017

on little coot feet.

You may have already heard the correct quote the way Carl Sandburg originally wrote it—”The fog comes. on little cat feet…” But this is different. This is coot, not cat. And coots have strange and amazing feet.

Well, just look at them—first of all, they are quite big feet, not little feet!

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And they are not long and skinny-toed like crow feet. Or wide and webbed like duck feet.

Instead, coots do have skinny toes, but with foldable fins on each toe.  So the contrast with crow feet is clear—coots are water birds.

But the contrast with ducks, those other water birds, is extremely interesting. Ducks have webbed feet, with webbing between the toes. When ducks pick up their feet, or move them forward in the water, the whole foot folds, to reduce drag. Then, as they push back, their feet flatten out again, so they press against a lot of water to propel them forward.

Coots use a more subtle system. For them, foldable skin flaps extend out on either side of the toes. When they lift a foot, or move it forward in the water, the flaps fold, reducing the drag against the water. Then when they push back, the flaps widen out and provide a lot of surface area for propulsion. This also helps them walk confidently over bogs or swamps or other kinds of squishy ground.

Plus, these clever feet are picturesque—green and gray and black and white—with striking patterns and colors for someone we think of as just little monochrone water birds.

Well, yes, not to mention red eyes and a red-brown forehead badge, and a charcoal back and white tailfeathers, and their pleasing football-shaped bodies.

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See nictitating membranes in action!

March 24, 2016

There’s a great nature event happening right now. Biologists have set up video cameras to watch a growing bald eagle family in the US National Arboretum in Washington DC, and anyone with an internet connection can watch them at any time.

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You can visit the DC EagleCam, 24 hours a day, at  http://dceaglecam.eagles.org

Even though this is the east coast, bald eagles also winter in the desert, usually in the high country. But the relevant  feature right now is that sometimes you can get a glimpse of the eagle’s nictitating membranes at work.

Here’s how. It’s best to watch in the day time. Click on one of the two cameras so you can more easily see the adult eagle’s eye, and enlarge the image, by clicking the bracket-box at the lower right corner of the video.

You will most often just see the eagle blinking–but every so often, you get to see the “third eyelid” swipe part way or all the way across the eye, starting from the corner nearest the beak. Wow!

And if you get so busy watching the adults and chicks and their activities you forget the third eyelid, that’s OK too!

…..Image taken April 6 2016 from dceaglecam.eagles.org © 2016 American Eagle Foundation, EAGLES.ORG

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Check out the nictitating membranes!

February 20, 2016

If you had to make your living in a desert, or under water, or by sticking your head into a rotting carcass to get your food, you’d probably appreciate a handy combo of goggles and windshield wipers.

And that’s what many creatures, including Turkey Vultures, have.

But instead of using the awkward term “combo-goggles-windshield-wipers,” we use the sleek and easy to remember name, “nictitating membranes.”

Uh huh!

Nictitating membranes are also called third eyelids, and are often translucent, so the eyes get protection while allowing some vision.

Sometimes these thin membranes rest under the lower eyelid, and rise from there, but more often, they are tucked into the corners of the eyes nearest the nose, and move back toward the sides of the head when in operation.

It can be unnerving the first time you see them in motion, a space-alien moment. But when the membrane is closed, it often just looks like a gray or white eyelid.

Here’s a Turkey Vulture doing a demo for you!

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First picture, nictitating membrane is open, and in the second, the translucent membrane is covering the eye.

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Wildlife Rescue Open House

November 13, 2015

If you are near the Phoenix, Arizona area next weekend, you have an opportunity to meet and learn about some of the cool creatures of the hot desert.

The open house is on November 21 and 22, 2015, at the Adobe Mountain Wildlife Center.

www.azwildlifecenter.net/events.asp

Because this is a wildlife rescue station, the population changes all the time. Depending on who is recovering there, you may see eagles, desert tortoises, bobcats, falcons, or ringtails.

Or maybe even the creative and industrious packrat!

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Ocotillos and visitors

April 8, 2015

So, the original idea here was to talk about how Ocotillo plants (Fouquieria splendens) in bloom seem to host bird or pollinator visitors at almost any time of day.

It seemed like a good idea to do at least one random sample of observation before declaring this.

And sure enough, during a 3 minute segment one spring afternoon, a few days into full bloom for the ocotillo, there were two bird visitors and several pollinator insects. Now this was just one casual observation, but it indicates how often you see creatures near or on these plants.

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As noted in an earlier post, Verdins, (Auriparus flaviceps) the very small birds with yellow heads, are frequent visitors, apparently looking for insects. Finches are also common. And hummingbirds can be seen throughout the year.

It is amazing that any birds can find a firm foothold on the thorny stems. Clever feet.

Remember that the ocotillo is not a cactus, although it may look like one during some parts of the year. It’s in a completely different group. In fact, for most of the year, it looks like a bundle of dead sticks, and if you first saw one for sale in a garden center, you might wonder what they were trying to sell.

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New Desert Creatures Mysteries e-book

August 12, 2014

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Now you can get a great Desert Creatures Mysteries e-book.

It goes into detail about the strange animals of the desert, and some of the cool science about them.

https://www.smashwords.com/books/view/455225