Interesting -- these are very similar to eBird "abundance animation" maps.
For an example, see Swainson's Thrush at
https://science.ebird.org/en/status-and-trends/species/swathr/abundance-map-weekly?week=6
and click the "play" arrow.

The eBird maps are more colorful, cover more species, and are based on
eBird reports.

The Audubon maps include yellow-highlighted individual birds from satellite
tracking, so that's cool.

On both you can zoom in on the maps and pause the animation as it scrolls
thru the year.



On Fri, Sep 16, 2022 at 6:10 AM Dan Reiff <dan.owl.reiff at gmail.com> wrote:


> Tweeters,

> Interesting. What do you think?

> Dan Reiff

>

> https://www.cbc.ca/news/canada/north/bird-migration-1.6584215

>

>

> Sent from my iPhone

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--
​Steve Hampton​
Port Townsend, WA (qatáy)