We built the Tree of Life Explorer! Check it out here: https://labs.minutelabs.io/TreeofLi...
And watch our video about why we made it:    • The Ultimate Tree of Life App...?  

With our current understanding of evolutionary history and our strategy of cladistic naming, if we wanted to have both goldfish and sharks under a single group called "fish", then mammals must also be called fish.

Thanks also to our Patreon patrons   / minuteearth   and our YouTube members.

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To learn more, start your googling with these keywords:
Phylogenetic tree: a branching diagram or "tree" showing the evolutionary relationships among various biological species
Cladogram: a diagram used in cladistics to show relations among organisms
Monophyletic group (or clade): a group of organisms that consists of all the descendants of a common ancestor
Paraphyletic group: all of the descendants of a common ancestor minus one or more monophyletic groups
Similarity trap: people can name different species the same thing, only to find out they aren’t even closely related. We made a video about this phenomana:    • The Similarity Trap  
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Credits:
Script Writer: Jasper Palfree
Script Editor: David Goldenberg
Video Illustrator: Sarah Berman
Video Director: Ever Salazar
Video Narrator: Ever Salazar & Jasper Palfree
With Contributions From: Henry Reich, Alex Reich, Kate Yoshida, Peter Reich
Music by: Nathaniel Schroeder:   / drschroeder  
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References:

Weinstein, Bret (2016). On Being a Fish. Inference, Volume 2, Issue 3 September. https://inferencereview.com/article/...

Lahti, David (2016). An Ambivalent Amphibian (In response to "On Being a Fish"). Volume 2, Issue 4
December. https://inferencereview.com/letter/a...

Podani, János (2013). Tree thinking, time and topology:
Comments on the interpretation of tree diagrams in
evolutionary/phylogenetic systematics. Cladistics Volume 29, Issue 3. May http://real.mtak.hu/9727/1/PodaniOnTr...