I was at the bookstore yesterday and ran into two new useful resources that looked interesting in this space.

Specific to birdsong, there was

200 Bird Songs from Around the World by Les Beletsky (Becker & Mayer, 2020, ISBN: ‎ 978-0760368831)

Read about and listen to birds from six continents. A beautiful painting illustrates each selection along with concise details about the bird's behavior, environment, and vocalizations. On the built-in digital audio player, hear each bird as it sings or calls in nature with audio of the birds provided by the Macaulay Library at the Cornell Lab of Ornithology.

This could be useful in using the book itself as a memory palace in addition to the fact that the bird calls are built directly into the book for immediate playback while reading/memorizing. There are a few other related books with built in sound in this series as well.

The other broader idea was that of

"A bird a day"

I saw the book A Bird A Day by Dominic Couzens (Batsford, 2021, ISBN: 978-1849945868) to help guide one towards learning about (or in our context maybe memorizing) a bird a day. It had names, photos, and other useful information which one might use to structure a palace to work at in small chunks. I know there are also many other related calendars which might also help one do something like this to build up a daily practice of memorizing data into a palace/journey/songline.

The broader "Thing-a-day" calendar category might also be useful for other topics one might want to memorize as well as to have a structure set up for encouraging spaced repetition.