Bald Eagles, and How Not to Call a Plastic Bag One
Okay, so this is the one where I have to tell on myself a little.
I once spent a good twenty minutes telling Leslie I'd spotted a bald eagle sitting up in a cottonwood by the water. I was so pleased with myself. It was a plastic bag, caught on a branch, flapping in a way that in my defense really did look alive from a distance. Leslie still brings this up. As she should. That's birding for you, you get confident about something and the world humbles you within the hour.
So let's talk about how to actually know it's an eagle, and not the remains of somebody's Macey's run stuck in a tree.
What you're actually looking for
Adult bald eagles are the easy ones, honestly. White head, white tail, dark brown body, all set against each other with hard edges, no blending. If you see that combination you've got it. The tricky part is everything that isn't an adult.
Bald eagles take four to five years to get that white head and tail. Before that they're various shades of mottled brown and white, blotchy, uneven, no clean pattern to them. A young bald eagle can look surprisingly like a golden eagle at a glance, and I will tell you right now I still sometimes have to sit with binoculars for a full minute before I'm sure which one I'm looking at. That's not a gap I'm ashamed of. Some days the bird just isn't cooperating with my confidence.
What helps most, same as with everything else we've done this winter, is shape and behavior before you even worry about color.
Size and silhouette. Bald eagles are big. Bigger than the red-tails we talked about last lesson, wingspan out past six feet on an adult. When one goes overhead the difference is obvious once you've seen it, but the first few times it's easy to second-guess yourself and think surely that's not as big as it looks. It is.
How they hold their wings. In flight, a soaring bald eagle holds its wings flat, like a board. Not tipping and wobbling the way our friend the harrier does. Not held up in a shallow V the way a turkey vulture does, which is a common mix-up out here. Flat, steady, like the bird is very sure of itself. Because it is.
Where they sit. Bald eagles like a big exposed perch near open water, something that gives them a clear view and a clear takeoff. A dead cottonwood snag by the lake is prime real estate. If you see a big dark shape sitting up high and still, that's worth stopping for.
What they're doing. A lot of what looks dramatic on nature documentaries is actually a bald eagle being kind of a bully. They steal fish from other birds more than they catch fish themselves, which I find endlessly entertaining. If you see one harassing an osprey or a gull midair, that's not unusual, that's just a Tuesday for an eagle.
A practical way to practice at home
Before you're even out on the trail, pull up photos of adult versus juvenile bald eagles side by side, just so your eye gets used to how different they look from each other. That's the part that trips people up, not the adults, the young ones. Look at the wing position in flight photos too, board-flat versus V-shaped versus tippy, and just sit with it for a few minutes. You're training your eye the same way you'd train a muscle. It won't click all at once and that's fine.
My opinion on this, because I have one
Learn shape and behavior before color, every time. I say this every lesson because I mean it every lesson. Color lies in bad light, and 8am on the ice with the sun barely up is bad light. But a bird's outline and the way it moves through the air, that doesn't change with the light. That's the thing that'll actually get you a correct ID, not the field guide photo you memorized.
About the cold, since we're out there a while for this one
Eagle-watching means a lot of standing still, glassing the same tree for ten minutes waiting to see if the shape moves. Standing still in January by the lake is a different kind of cold than walking cold. Back when I was dancing I could stand around in a cold studio for an hour and not think twice about it, we just didn't heat those spaces well and nobody complained. I assumed that tolerance would just carry over to birding. It did not. I got out there that first winter and about twenty minutes into standing still I realized my body had apparently retired from that particular skill. Now I dress like I'm headed up the canyon even though we're standing on flat ground a few minutes from the freeway, and I budget an extra pair of socks specifically for the days we're doing a lot of standing rather than walking. Cold feet will end your morning faster than anything else out there.
Before next time
Take a look at some juvenile bald eagle photos before our walk, just so that shape and that blotchy coloring isn't a total surprise to you. And bring the extra socks. We'll be standing still more than usual for this one.