Guys they reintroduced Galapagos tortoises to espanola island and they’ve essentially terraformed their environment, knocking over invasive plants so that endangered albatrosses (who need space to take off using the ground as a runway) have returned and established nests!
https://www.popsci.com/environment/galapagos-giant-tortoises-ecosystem-conservation/
'you know what? fuck your plant *rebuilds albatross runways*'
When my housemate's tortoise got to a certain size, they gave it free run of the backyard. It's been really fascinating watching the ecosystem succession happening in its wake over the last decade or so.
we've had to reinforce the fence multiple times so it doesn't do the same to every other backyard in the neighborhood