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The TRUE Indicator Bird of Spring - Which bird means spring is near?

Many will argue with me for this statement, but American Robins do not indicate spring has arrived in my home state. Read on to learn WHY!

A Red-winged Blackbird sits on a sign, singing
Red-winged Blackbird singing on a sign

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This post focuses on my state of residence, Wyoming. This is where I roost, so I used it as the starting point for the following argument. Want to determine your own spring bird? Check out eBird!

Which bird indicates spring has sprung?

Likely, there is no singular species that would indicate spring has arrived for the entire country. For every state, there are likely multiple species that could be easily argued as the harbinger of longer days and warmer weather. And for a state with an almost seemingly perpetual winter, the Red-winged Blackbird is my nominee. Now, many will argue the Red-winged Blackbird overwinters in Wyoming. Yes, I understand that. BUT! Most Red-winged Blackbirds leave Wyoming and return around mid-March. Disbelief from the peanut gallery? I've got data to back me up.

Also, does anyone still use the phrase peanut gallery? And why do we use it? It was based on the cheap seats in the back/top of the theater, and they ate the cheaper snack, peanuts. But why would that crowd be so critical? Moving on...

Data on spring bird arrivals: Red-winged Blackbird vs American Robin

The following charts tell a story of two birds that definitely become more prevalent during spring. However, one of these two birds mostly disappears during the cold, blustery months. The other bird hangs around, feeds on berries, and plays in the snow. That's right; the American Robin does not leave this icescape during the winter. In fact, robins may not leave most areas in winter...

Red-winged Blackbird Abundance Data in eBird for Wyoming *
American Robin Abundance Data in eBird for Wyoming *

BOOM! Datum drop. It is like a mic drop but way nerdier.

Maybe you are struggling to interpret these graphs. If you are, do nay worry a wee little hair on thy head. I will tell you what they mean.

First, let us address abundance. Here is how eBird defines its use of abundance:

"Abundance" is the average number of birds reported on all checklists within a specified date range and region. These data tell us what we might to expect when going out birding on an average day. The checklists used in this calculation include those that didn't report the species, providing a measure of relative abundance or how commonly the bird is reported compared to all other species in the region. For example, when looking at data for New York we see that during the week starting 15 May we can expect to find roughly 1 Yellow Warbler while out birding. In contrast, in the same region during the same week we see that zero Rough-legged Hawks, primarily a winter visitor, can be expected in an average day's birding.

Easy enough, right? Right. Back to the graphs. What these graphs tell us: during winter in Wyoming, we can expect to see approximately ONE American Robin on any given day and are NOT likely to see a Red-winged Blackbird during the average day, with an abundance of approximately one-tenth.

However, this is still not my most significant point. I want to turn your attention to the CHANGE in abundance from the week of 1/1 to 3/22 (the first full week of spring). For the Turdus (American Robin, but I really just wanted to type Turdus), we change from an abundance of ~1 to ~1.8. And in the Red-winged Blackbird, we see a change from ~.9 to ~5.8! Yes, that is right. The American Robin did not even achieve a doubling in abundance in that time frame, while the Red-winged Blackbird came storming back to increase in abundance well over FIVE TIMES!!

I rest my case. Hello Red-winged Blackbird, and hello, spring.

Does the Red-winged Blackbird's song indicate spring for you?

  • Yes

  • No

  • I'm outraged at this nonsense! (The Mom option.)

You can vote for more than one answer.

Please do not yell at me, Mama. (She vehemently disagrees with me. She raised me.)

Want to see all that in real-time? Check out this animation from eBird:

What is the indicator of spring where you live? Leave a comment below!


If you enjoyed this post, or wish to argue endlessly, sign-up here, then use the comment section below!!


Red-winged Blackbird Graph: Image provided by eBird ( and created March 6, 2019.
American Robin Graph: Image provided by eBird ( and created March 6, 2019.
Fink, D., T. Auer, A. Johnston, M. Strimas-Mackey, M. Iliff, and S. Kelling. eBird Status and Trends. Version: November 2018. Cornell Lab of Ornithology, Ithaca, New York.


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It is definitely a great candidate! I would not dismiss it as quickly as I do with the American Robin.


Ross G.
Ross G.
Mar 18, 2019


Ross G.
Ross G.
Mar 18, 2019

May I suggest that the Sandhill Crane be nominated as the bearer of Spring.

As Zach has already demonstrated with the data: Robins are already around during the last stretches of Winter. By the time Spring has arrived (roughly March 20th) Blackbirds and Bluebirds have already arrived in Wyoming.

Yet I usually don't see Sandhill Cranes until after St. Patty's Day. In fact, this year I saw my first SC this morning (March 18th). It was a solitary Sandhill that was foraging in a cut field, and it was calling for its kind. So I suspect this lonely SC was a tad early. But I'm sure others are close behind.

By arriving so close to March 20 certainly warrants considering…


Agreed. Two very crucial points in determining springs arrival. (I finalized those dates Monday, and will email them before Friday!)


Ellis Hein
Ellis Hein
Mar 07, 2019

I think the best harbingers of spring are (1.) when those bird-banders start getting restless, wondering if Zach will soon announce the dates. And (2) Lewis goes to Peru, which only adds to banding fever in those who aren't there.

Zach is showing off gear and encouraging visitors to check out his favorite gear on his Amazon Associate page.

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