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Every once in a while, traits thought to be lost forever suddenly reappear, like a dolphin or a whale born with complete hind limbs! Known as atavisms, these occurrences can teach us all sorts of things, like how limbs actually grow.

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Sources:
Dollo’s Law/Atavisms
https://pubmed.ncbi.nlm.nih.gov/7991619/
https://doi.org/10.1016/j.tree.2008.0…
https://doi.org/10.1002/ajmg.a.36234
Cetacean Hind Limbs
https://doi.org/10.1007/978-1-4899-01…
https://doi.org/10.1073/pnas.0602920103
https://doi.org/10.1046/j.1525-142X.2…
Limpet Shell Twists
https://pubmed.ncbi.nlm.nih.gov/16701…
https://doi.org/10.1098/rspb.2003.2517
Soil Mite Sex
https://doi.org/10.1073/pnas.0700034104
https://doi.org/10.1002/ece3.5303
https://doi.org/10.1016/0305-1978(92)…
Big Bone Worm Males
https://doi.org/10.1016/j.cub.2014.11…
https://doi.org/10.1016/j.crvi.2008.1…
https://doi.org/10.1038/s41467-017-01…
https://doi.org/10.1186/1741-7007-7-74

Images:
https://commons.wikimedia.org/wiki/Fi…
https://link.springer.com/article/10….
https://link.springer.com/article/10….
https://commons.wikimedia.org/wiki/Fi…
https://www.inaturalist.org/observati…
https://www.inaturalist.org/observati…
https://www.inaturalist.org/observati…
https://www.inaturalist.org/observati…
https://www.flickr.com/photos/jsjgeol…
https://www.flickr.com/photos/treegro…
https://eol.org/media/6248881
https://www.flickr.com/photos/treegro…
https://www.flickr.com/photos/treegro…
https://www.flickr.com/photos/scripps…
https://www.flickr.com/photos/scripps…
https://www.flickr.com/photos/scripps…