Turns out robot maker Festo did more than just dream about robot tentacle arms; they instantiated their idea, using elephant trunks as their model. Take a look at this demonstration video.
(Festo Bionic Arm)
I was also fascinated by the fabrication process, which creates lightweight, flexible and energy-efficient robotic manipulators.
Festo has been very creative in the last few years; take a look at some of their work:
Festo Aqua Ray Robot
Aqua_ray is a remote-controlled fish driven by water hydraulics, the shape and movements of which have been based on the model of a manta ray.
Robot Arm With Fluidic Muscles
The company describes it as a "combination of mechatronics and the biological model of a human being."
Pole-Dancing Stripperbot Robot
'Why, a clockwork dancer, or, better still, one that would go by electricity and never run down...' - Jerome K. Jerome, 1893.
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Tumblin' Tumbleweed Rovers To Eplore Mars
'His sensors out and working, and the whirring of the tape that sucked up sight and sound and shape and smell and form...'