Does evolution ever reverse itself? Regressive evolution means that animals or organisms lose some of the complexity they had in the past. There's one specific group of animals that really dived into reverse evolution: whales, dolphins, seals, and sea turtles. They've really changed a lot over the last 350 million years, moving from sea to dry land and back to sea!

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Credit:

NASA/Earth Science and Remote Sensing Unit, Lyndon B. Johnson Space Center

Black sheep: Jesus Solana, CC BY 2.0 https://creativecommons.org/licenses/..., https://commons.wikimedia.org/wiki/Fi... Ice age: Mauricio Antón, CC BY 2.5 https://creativecommons.org/licenses/..., https://commons.wikimedia.org/wiki/Fi...

CC BY-SA 2.5 https://creativecommons.org/licenses/...

Astrophytum asterias: Dr. David Midgley, https://en.wikipedia.org/wiki/File:As...

Glomeris marginata: Stemonitis https://en.wikipedia.org/wiki/File:Gl...

Rhagoletis pomonella: Joseph Berger, Bugwood.org, CC BY 3.0 https://creativecommons.org/licenses/..., https://en.wikipedia.org/wiki/File:Rh...

CC BY-SA 3.0 https://creativecommons.org/licenses/...

Toby Hudson:

Labeotropheus https://commons.wikimedia.org/wiki/Fi...

Maylandia https://commons.wikimedia.org/wiki/Fi...

Cichlid blue https://commons.wikimedia.org/wiki/Fi...

Pinicola enucleator: Cephas https://commons.wikimedia.org/wiki/Fi...

Doc. RNDr. Josef Reischig, CSc.:

Cyanobacteria https://commons.wikimedia.org/wiki/Fi... Cyanobacteria https://commons.wikimedia.org/wiki/Fi...

Sphaeromyxa hellandi: Ivan Fiala https://commons.wikimedia.org/wiki/Fi...

Cyprinidae: Hectonichus https://commons.wikimedia.org/wiki/Fi...

Astyanax mexicanus: H. Zell, https://commons.wikimedia.org/wiki/Fi...

Bottlenose dolphin: Peter Asprey, http://www.peter-asprey.com/, https://commons.wikimedia.org/wiki/Fi...

Euphorbia obesa: Frank Vincentz, https://en.wikipedia.org/wiki/File:E_...

Armadillidium vulgare: Franco Folini https://en.wikipedia.org/wiki/File:Ar...

CC BY 4.0 https://creativecommons.org/licenses/...

Homo neanderthalensis: Jakub Hałun https://commons.wikimedia.org/wiki/Fi...

Symbiotic nitrogen: LegumeLover, https://commons.wikimedia.org/wiki/Fi...

Parasite: Marcelo Knoff, Simone Chinicz Cohen, Melissa Querido Cárdenas, Jorge M. Cárdenas-Callirgos and Delir Corrêa Gomes https://commons.wikimedia.org/wiki/Fi...

CC BY-SA 4.0 https://creativecommons.org/licenses/...

Invertebrate montage: Dan Parsons, François Michonneau, Nhobgood, Sanjay Acharya, jbrasher, Jnpet, GlebK, Bernard DUPONT, Schokraie E, Warnken U, Hotz-Wagenblatt A, Grohme MA, Hengherr S, et al. (2012) https://commons.wikimedia.org/wiki/Fi...

Lucy: Neanderthal-Museum, Mettmann https://commons.wikimedia.org/wiki/Fi...

Shark eggs: Yohanes Wahyu Nurcahyo https://commons.wikimedia.org/wiki/Fi... Cladoselache: Armin Reindl https://commons.wikimedia.org/wiki/Fi...

Saaser Mutte: Namma! https://commons.wikimedia.org/wiki/Fi...

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