262 views

6:53

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

What is a species?

submitted by Aard Vark

(oritteropo)
8 years 8 months 2 weeks ago

YouTube description:

New species of lifeforms are being discovered and described on our planet every single day -- but, when we talk about a species, what are we really referring to? Turns out, the answer is... complicated.

This video is by no means comprehensive. Species concepts are some of the most complex and, at times, controversial topics in biology. This video ought to serve as your window down into the rabbit hole. If you're interested in this sort of thing, check out some of the articles below!

Why should we care about species?
http://www.nature.com/scitable/topicp...

'A list of 26 species 'Concepts''
http://scienceblogs.com/evolvingthoug...

The 'Open Tree of Life'
https://tree.opentreeoflife.org/opentree/opentree4.0@1/cellular-organisms

Amorous turtles:
http://rsbl.royalsocietypublishing.org/content/early/2012/06/15/rsbl.2012.0361.full

'Virgin Birth' by shark confirmed; second case ever
https://www.sciencedaily.com/releases/2008/10/081010173054.htm

big BIG BIG thanks to Drs Caleb McMahan, Olivier Rieppel, and Joyce Havstad for helping this script come together. Your feedback was much appreciated!

Thanks to Matthew Young and everyone else at The Macaulay Library at the Cornell Lab of Ornithology for the meadowlark calls and footage!
Video footage c/o Timothy Barksdale, Jay W. McGowan, and audio by Wilbur Hershberger.

---------------------------------------------------------------------
Come hang out in our Subreddit: http://www.reddit.com/r/thebrainscoop/
Twitters: @ehmee
Facebook: http://www.facebook.com/thebrainscoop
Tumblr: thebrainscoop.tumblr.com
---------------------------------------------------------------------
Producer, Writer, Creator, Host:
Emily Graslie

Producer, Editor, Camera, Graphics:
Brandon Brungard

---------------------------------------------------------------------
This episode is supported by and filmed on location at:
The Field Museum in Chicago, IL
(http://www.fieldmuseum.org)
---------------------------------------------------------------------