A rail species twice evolved into a flightless species on an island that then submerged and re-emerged.
“The extremely rare process is known as iterative evolution -- the repeated evolution of a species from the same ancestor at different times in history.”
https://www.cnn.com/2019/05/10/africa/white-throated-rail-extinction-scli-intl-scn/index.html
The press release that references the original scientific paper:
https://www.eurekalert.org/pub_releases/2019-05/uop-tbt050919.php
Quote from above Eurekalert website:
“Fossil evidence presented here is unique for rails, and epitomises the ability of these birds to successfully colonise isolated islands and evolve flightlessness on multiple occasions.”
Link to abstract and paywalled journal article:
https://academic.oup.com/zoolinnean/advance-article-abstract/doi/10.1093/zoolinnean/zlz018/5487031?redirectedFrom=fulltext
See Wikipedia:
https://en.m.wikipedia.org/wiki/White-throated_rail