Wednesday, January 28, 2009

Grassland Raptors of Guyana

Every June, we go to the prairie pothole region of central North Dakota. I'm amazed anew each June as I am reminded how much life can be packed into a grassland. Maybe it's just that you can see the life of a grassland so much more easily than that of a forest. There is a whole lot of life in savannas.

Our conveyance along Ginep Road near Rockview Lodge was a huge crawler diesel that went about ten to twenty mph along the dusty road. We were loaded into the open back, which afforded good, albeit dusty and diesely, birding ops. Time and time again in the tropics I find myself in vehicles like this, where one must bang vigorously on the cabin roof to get the attention of the driver when a good bird or animal hoves into view. Because everything is of interest, the Science Chimp's impulse is to bang nearly constantly on the roof, so I know enough to stay away from the cab.

How different the savanna was from forest! This is natural savanna, formed where the soil is too shallow to support tree life. It was very odd to see a troupe of brown capuchin monkeys making their way from one treed hillock to the next. I really felt I was in Africa--again and again I believed that, and had to remind myself that this was South America.You can see the monkeys' curled tails as they bound down the hillside. Lovely creatures!

Here is a savanna hawk, to scale in its immense landscape.

And here, a close-up (though not nearly close enough for me) of this long-legged beauty, Buteogallus meridionalis. What a gorgeous beast, long winged and big-bodied. It's after snakes and lizards mostly, and it loves a good grass fire, which sends its prey leaping and scuttling right into its strong yellow toes and stiletto talons. What you can't quite make out in this photo is the fine vermiculate barring on its neck and breast. Breathtaking.
Another savanna hawk's eye gleams as it scans the scrub for lizards.

The roadside hawk (Buteo magnirostris) is a common little thing that might as well be called a riverside hawk. I always get a kick out of its No. 2 pencil-orange cere and feet. Crested caracaras (Polyborus plancus) always take my breath away. They are simply spectacular, and when they fly there huge white patches in the primaries flash. There's something a bit curassow-like about them as they stalk around, but they're raptors all right, and they're always looking for something dead, dying or disabled to exploit. Their feet are better for walking than grasping, so they feed on small prey from insects to small mammals, and exploit carrion as well. Polyborus means, loosely, "multiple gluttonies."
I like the name Mexican Eagle for this bird--this pair reminded me of the Mexican coat of arms.

Oh! What are you, most beautiful thing? I know I know you...I've seen you before, with your snowy breast and chestnut shoulders. Your color scheme is the bomb.
Let me guess. Hmmm.
White-tailed hawk? (Buteo albicaudatus)

Yes. A raptor with a good, good name, and a voracious predator of everything from insects to rabbits. All told, I was very glad not to be a mouse on the Guyanan savanna.

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Wednesday, June 13, 2007

Longspur Joy

Bill and I worked very hard at the Potholes and Prairies festival in Carrington, North Dakota. We led two field trips, each gave a seminar, performed music for two functions, and I gave a keynote--all in three days. We didn't get a chance to go to some of our favorite spots, like Chase or Horsehead Lakes, to see some of the prairie specialties. We birded when we could, squeezing in a few hours here and there. North Dakota is so generous with its landscapes and birds, though, that we were surrounded by beauty wherever we went. Imagine driving down a highway, and there are all kinds of birds in the air, and instead of being starlings or rock pigeons, they're all different kinds of ducks and shorebirds. That's what's common out there.

But we missed some birds, like Baird's and Nelson's sharp-tailed sparrow. And chestnut-collared longspur, one of my very favorites. This little bird likes unbroken prairie, with shallow, gravelly soil and protruding rocks. After five years, Bill and I will say things as we drive like, "This looks longspurry to me." And we've found lots of great birds that way. This time, though, we got exact directions to a place with longspurs, and took off at 5:30 PM Sunday to find them. Our dear friends Ann and Ernie Hoffert accompanied us. Ernie amused himself while we were shooting longspur portraits by dipping his toe into digiscoping, coming up with some excellent results. I think we may have gotten him hooked. And Ann birded for a long time, then just relaxed and soaked up the landscape, a pursuit she has taken to a high art. She is the most serene and contemplative of companions.And we found a longspur, perhaps the friendliest, most cooperative bird we could have asked for. He had a couple of favorite song perches and he sang like a madman, bopping from one to the other. Bill and I approached, slow and low, and eventually were just outside his comfort zone.

There is a decision to be made in cropping one's bird photos. Do you go for the luscious, full-frame bird, or do you try to give some idea of where and how it lives? Although closeups are delightful, I just can't bear to crop off the prairie plants that are so vital to its existence, and so I offer you these. I had to get down on my knees to bring the bird above the distant horizon. When you have a super-cooperative bird, you have the leisure to think about composition , instead of just trying to get the darn thing in focus.Perhaps my favorite shot, and it also happens to be sharp. When I cropped it in closely, the bird was tack-sharp, but the dried artemesia stalks seemed to evoke its liquid rollicking song, and so they stayed.And for a look at how the chestnut-collared longspur got its name, this:This is such an ornate little bird, and it's utterly different depending on what view you get. A black breast and belly make a potent visual message on bright, open grassland, and all a longspur has to do is face his rival to make a statement. No wonder good song perches are vital to good habitat for prairie birds. You have to make yourself known.This is why so many grassland birds--red-winged blackbirds, meadowlarks, dickcissels, horned larks, snow buntings and longspurs, to name a few, have such strikingly contrasting markings. Black reads well in landscapes that are flooded with light. There's nothing subtle about a longspur, head-on. And yet, he can turn his back on you, and melt into the grasses.

Meadowlarks do this all the time. Ever wonder why they always seem to be facing away from you when you try to get a look at them? They're hiding from you on purpose, because they know that their bright yellow breast and black vee will attract your attention. I'll never forget watching a migrating flock of eastern meadowlarks feeding at Anzalduas Park in south Texas. When we first spotted them, it was like a field full of daffodils. The moment the meadowlarks became aware that they were being watched, they all turned their backs on us at once, and the flowers melted away.

I originally made one huge post about this one sweet little bird, but decided to cleave it in half. So there will be more longspur joy in the morning.

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