Hoofprints in the Sand: Wild Horses of the Atlantic Coast by Bonnie Urquhart Gruenberg (whose
Wikipedia entry does look rather self-promo) is her lavishly photo-illustrated regional animal-exploring historical origins/behaviour/present-day situation of Exactly What It Says In The Title, free courtesy of the author herself, who is reprinting it from its 2002 Eclipse Press hardcover edition, which apparently was the publishing branch of an
outfit that specialized in a whole
bunch of horse-breeding things (and also happens to be the name of an
imprint that helps you self-publish your book, especially if it has to do with horses).
In any case, this is a pretty nice-looking freebie filled with lots of pictures of horses, and a quick skim of the introductory portion didn't show anything which obviously contradicted my vague recollections of my intro paleontology courses, and there's a fair chunk of interesting-looking history bits about just how wild horses came to populate the Atlantic Coast and how people interact with them now, so
(Disclaimer: I know nothing about horses otherwise, so I've no idea if the author is just making stuff up, so YMMV on how

you find this.)
Currently free (and DRM-free) for up to the next 5 days @
Amazon (available to Canadians & in the
UK and pretty much worldwide as part of that KDP Select exclusive-or-else thing).
And this has been the (late!) selected 3rd (non-repeat) free ebook thread of the day.
Because
horsies! it's nice to get more nature/science/history-oriented stuff that's presented reasonably well by people who seem to have a decent idea of what they're talking about, hopefully.

And DRM-free!
Enjoy!
Description
Many theories surround the origins of the wild horses that inhabit the barrier islands of the Eastern seaboard. Did they swim ashore from ships that sunk en route from Spain to the New World? Were they left behind by early settlers to eke out a tenuous existence in harsh environs? In Hoofprints in the Sand, Bonnie U. Gruenberg investigates how these wild herds came to populate islands off the coasts of Maryland, Virginia, North Carolina, and Georgia.