Most mammals can develop bones in their hearts. For humans, it's usually a bad thing, but for river otters, it could be a useful adaptation. Hosted by: Stefan Chin SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Bd_Tmprd, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Sam Lutfi, Piya Shedden, Katie Marie Magnone, Scott Satovsky Jr, Charles Southerland, Charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: Cardiac skeleton overview pubs.rsna.org/doi/full/10.1148/rg.2017170004 Bones in the heart skeleton of the otter (2000) www.ncbi.nlm.nih.gov/pmc/articles/PMC1468091/pdf/joa_1963_0485.pdf (2001) www.researchgate.net/profile/Heike_Weber4/publication/228704564_Hearts_and_Bones-The_Heart_Skeleton_of_the_Otter_Lutra_lutra/links/5655942b08ae1ef929772738/Hearts-and-Bones-The-Heart-Skeleton-of-the-Otter-Lutra-lutra.pdf Healthy heart: lessons from nature’s elite athletes journals.physiology.org/doi/pdf/10.1152/physiol.00017.2015 AHOOO Structures onlinelibrary.wiley.com/doi/full/10.1111/brv.12597 Osteogenesis and endochondral ossification www.ncbi.nlm.nih.gov/books/NBK10056/ Chimps develop os cordis www.nature.com/articles/s41598-020-66345-7 Images: en.wikipedia.org/wiki/File:Gray495.png

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