What If Birds Left Tracks in the Sky?
Photographer: Xavi Bou
An arctic tern creates an unusual shape as it takes flight.
A beautifully ornate pattern made up of a flock of Northern lapwings.
A group of corn buntings seem to erupt out of the ground.
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A female falcon was equipped with a satellite tracking system in South Africa before migrating to Finland. Image shows tracker data. In just 42 days, she flew over 10.000 km, at an incredible average of 230 km per day and nearly in a straight line.
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Just a random question I had, but, I'm curious. So pterosaurs—at least some of them—were very large. However in modern times, the flying animals that exist are much smaller. Was the atmosphere easier to fly through millions of years ago or is it just that there aren't as many super big animals so there isn't a niche for a super big flying animal? Or was there something unique about Pterosaurs that made them capable of getting so huge? Or none of the above?
this is a question many researchers have themselves! we aren't sure. the atmosphere *was* different, but not in ways that would affect flight as far as we can tell. It's possible that Neornithines (aka "modern birds") just can't fly at those big of sizes. They do have fundamentally different (and weird) wings, compared to membraneous wings. They did get bigger than today - the largest flying birds such as Pelaogrnis and Argentavis are all extinct.
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I found the Snowy Owl! Using the recent sightings reported in the area as my guide, I went driving around Dane, WI yesterday. I stopped to scan a corn field with my binoculars and spotted this guy perched on a fence post.
[ID: A male Snowy Owl sits on a wooden fence post and stares directly at the camera. He is almost entirely white, with a few brown flecks on the wings and breast. His eyes are yellow and partly closed. A light snow falls around the Owl. End ID]
I knew right away the large white bird on the post was the Snowy I was after, so I quickly grabbed my camera and got out to find a good spot to set up. Of course, as soon as I got the bird in frame he decided to fly up to the roof peak of a farm building further away. Even so, I sat down and took a few long-distance bursts in case that was only look I would get. Then I noticed that there was a house among the farm buildings. If someone was home maybe they'd let me take a closer look?
[ID: A male Snowy Owl sits on a wooden fence post and looks into the distance to the left. He is almost entirely white, with a few brown flecks on the wings and breast. His eyes are yellow and partly closed. A light snow falls around the Owl. End ID]
Just as I'd hoped, the folks living there were home and they were happy to let me onto their property for a chance at a better photo. They even pointed out a good spot behind a concrete wall where I could stand totally out of sight of the corn field. It turned out to be such a good blind that all the shots in this post were taken there. And just as we were talking, the Owl flew back down to that same fence post!
[ID: A male Snowy Owl sits on a wooden fence post and looks into the distance to the right. He is almost entirely white, with a few brown flecks on the wings and breast. His eyes are yellow and partly closed. A light snow falls around the Owl. End ID]
He was very cooperative, sitting mostly still while I fiddled with settings and let the auto-focus pick between the snow and the post. I figure he was hunting, scanning the field for little creatures. Then he did a little preening and stretched his neck before taking flight!
[ID: A male Snowy Owl takes flight. He is almost entirely white, with a few brown flecks on the wings and breast. His eyes are yellow and partly closed. His wings are fully extended upward and his shaggy legs hang down below, showing just a hint of black talons. Its eyes are closed to slits. A light snow falls around the Owl. End ID]
[ID: A male Snowy Owl flies low over a snow-covered corn field. He is almost entirely white, with a few brown flecks on the wings and breast. His wings are extended downward, showing the full pattern of white and brown flecks on the flight feathers. His eyes are closed to slits. A light snow falls around the Owl. End ID]
He didn't immediately pounce on anything, instead wheeling up toward a tree across the field. I thought he would land up there, but instead he flushed a smaller dark bird and started chasing it! Zooming in on the photos of the sortie revealed that the enemy was either a Cooper's or a Sharp-shinned Hawk. I wish I could have seen how that encounter turned out, but they flew out of sight across the field.
[ID: A male Snowy Owl chases a hawk in the distance, flying through the snowfall near a large barn. End ID]
Even without a high-speed pursuit, seeing the Snowy Owl so close was my top birding moment of the year so far. Many thanks to Dean and Deb for welcoming me onto their property and making this moment possible!
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