Showing posts with label courtship display. Show all posts
Showing posts with label courtship display. Show all posts

Wednesday, May 29, 2019

The CHIRP! Of Love Is In His Face

This is a fact. Dave has a history of being dive-bombed by birds. There are many reasons this could happen, but the primary one is that birds are shitty judges of character. Dave is not a threat to birds. Any bird should be able to read it in his face, but apparently his face is too far off the ground for their comfort. I can walk right next to him and they'll go for his head every time.

But until this week, we'd never seen him get threatened by a hummingbird.

Our local Anna's hummingbirds do an awesome courtship display that involves flying up to the stratosphere and then arrowing down at warp speed, pulling up a the last second before *splat*, and then zooming back up again. Moreover, there is a tremendous CHIRP! sound right there at the bottom end of the flight, coming in fact from the bottom end of the bird. Quite recognizable. Whenever we hear it, we look straight up to locate the aerobat and watch him do it again. He pulls out of his dive right at about eye level from a prospective mate, who is observing from a twig. It's attention-getting.

This time we heard the CHIRP! just off Dave's shoulder. And--we checked--there was no female hummingbird in sight. We stood still. We waited. And sure enough, a half minute later, that hummingbird swooped down within a foot of Dave's left ear.

He was impressed, but not enough to have sex with a hummer.

So we don't know what was going on. It felt threatening.  It felt like the bird was trying to chase Dave off, not get Dave off. But who knows? Either Dave looks like another male threatening his territory, in which case we would assume it would fly straight at his hat, and not do a courtship display. Or, he finds Dave very attractive, and he would like to have three seconds of sweet hummingbird bliss on some suitable orifice, several of which come to mind.

Because as far as I know, male hummingbirds do not defend the nest. They have nothing to do with the nest. They defend their own territory of flowers and hope to entice a girl into their territory and chase off rivals and go to considerable trouble for that three-second wham-bam and then it's Sayonara, Sis, and good luck with the kids. So although other kinds of birds might try to discourage Dave from getting near their nests, the male hummer has gotten all he wants out of the relationship and is back to looking out for Number One.

That leaves attraction as the only other possibility. Something about Dave appeals to a male Anna's hummingbird. The male makes that tremendous noise during his courtship display with just his tail feathers and maybe he senses a kindred spirit in Dave.

All alone and feeling blue, and green, and yellow, and...
But the ability to make remarkable noises from your tail end isn't much to go on in a relationship. Sure, it worked for us, but we're a special case.

We should ask Anna. It's her hummingbird. Anna Masséna, the Duchess of Rivoli, was probably pretty hot. At least she was all the rage in the ornithological community. Her husband, the Duke of Rivoli, was an amateur ornithologist, which is to say he had an enormous dead bird collection. John James Audubon took a fancy to her too, but it was another ornithologist who thought to name the hummingbird after her. Audubon was probably doing this long involved courtship thing and making a gigantic bird painting for her, and then René-Primivère Lesson swoops in all CHIRP! and says "Ma chérie, I give you zees hummingbaird." No one knows what the Duke of Rivoli was doing all this time, but apparently not defending his territory.

Saturday, April 28, 2018

Itsy Bitsy

I don't know much about the natural world. That's because the natural world is really big, with lots of little things in it. I know more than most people, but probably less than a decent cross-section of my friends. You know how you'll hear someone "wrote the book" on something? That's not always metaphorical. I have friends who know so much about stuff that they can write authoritative books about it, in spite of which they tend not to be all that well-off, because they did not have the foresight to get into the more lucrative fields of pharmaceutical price-gouging or pension stealing, and failed to consider net worth when they were selecting their parents.

But not knowing much means life is a lot of fun for me. Because there are so many things I can still learn. Every day. All it takes is a little noticing.

For instance, I was noticing as I put on my gardening gloves that there was a little patch of spider silk, maybe the size of your thumbnail, right in the palm where there had been none just the day before. And there was somebody in it. Excellent! I thought. Clever little dude already caught some dinner. But then the dinner walked out. And I had to reassess.

I got my nose just about on it to ascertain it was a spider, and then I took a gorgeous portrait of it, and had to write about it. You can't look at a little dude like this without wanting to know more about him. I usually assume most spiders I see are females because I have this notion the males are small and hiding out, trying to figure out how to get their rocks off without getting eaten, which makes them subject to existential dread and harder to spot. But I think this one is a male. And if he isn't, one of my smart friends will jump in and tell me--just watch.

It's a jumping spider! Also known as a Bold or Daring jumping spider. Lots of folks object to spiders jumping, but in truth, a lot of those people take exception to spiders even when they're sitting quietly pondering stuff and not moving at all. I'm sympathetic, to a degree: I don't believe snakes should climb trees or swim, but they do, so we have to just roll with it. And jumping spiders are so small they're unlikely to be able to wrap their tiny faces around our fat asses anyway. Mine was a quarter-inch long, and don't mess with me about that, because I am a quilter and I know my quarter-inches. But they're the largest family of spiders there is.

The little thumbnail-sized patch of silk in my gardening glove is not a trap for prey. They construct them just to hole up in, of an evening. Or winter over in. Or stash some eggs in. They're shelters. Next time it's a little nippy out and you forgot your sweater, imagine that: you could have pumped a little pup tent out of your own butt.

So they're not trappers, they're hunters. That's where the jumping comes in. And they don't have musculature per se but a nice set of hydraulics in their legs and plenty of eyes for spotting things with. Plus, they attach an anchor line of silk before they jump so they can zoodle themselves back to where they started.

The famous Peacock spiders are jumping spiders, but even without the fancy colors, regular jumping spiders like my friend have an awesome courtship display. Legs shoot out straight, quiver, vibrate, bump and bounce: he's drumming the whole time. According to Wikipedia, he does this because he doesn't want to be considered food. I call baloney. I distinctly remember being an adolescent: the boys were drumming all the time. They couldn't stop drumming. It was either that, or, you know.



Anyway the same source suggests that the female spider signifies her willingness to entertain by sitting passively in a crouching position. I'm not sure why crouching is considered to be passive, in a jumping spider. But hey. It's his call.