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Sea Cucumbers Have Multipurpose Butts

Meet the most versatile butts in the animal kingdom
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(Primary Literature) The anus as a second mouth: anal suspension feeding by an oral deposit-feeding sea cucumber: http://bit.ly/2ibnzXa

(Primary Literature) Mechanisms involved in pearlfish resistance to holothuroid toxins: http://bit.ly/2ibg4z8

(Primary Literature) When a repellent becomes an attractant: harmful saponins are kairomones attracting the symbiotic Harlequin crab: http://go.nature.com/2ibltGv

Host, Writer, Editor, Animator
Anna Rothschild

Camera, Sound
Zachary Hoffman

Welcome to the Circus a
Music Provided by APM

Original Footage
©WGBH Educational Foundation 2017

FOOTAGE AND IMAGES

Images of Sea Cucumber Butts
By Klaus M. Stiefel

Graceful pearlfish (Encheliophis gracilis) living inside sea cucumber (Bohadschia argus) on reef, West Papua, Indonesia
Getty Images/BBC Natural History

A common, large sea cucumber (Bohadschia argus) is easy to identify due to its distinctive pattern. This species can extrude sticky defensive threads called cuverian tubules.
Shutterstock/Ethan Daniels

Cloaque Femelle
Wikimedia Commons/Au Domaine des 3 Coqs

Swimming Crab – Lissocarcinus Orbicularis on Sea Cucumber
Wikimedia Commons/Prilfish

Lissocarcinus orbicularis LandaaGiraavaru
Wikimedia Commons/MDC Seamarc

Pseudocolochirus axiologus
Wikimedia Commons/Marrabbio2

Pearsonothuria graeffei bouche
Wikimedia Commons/Frédéric Ducarme

SFX

Cockroaches
Freesound/StateAardvark­
(used with permission from author)

Squeak Pack/squeak_10
Freesound/Corsica_S

Produced by WGBH for PBS Digital Studios

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