When marine biologist Roger Hanlon captured the first scene in this video, he started screaming. Hanlon studies camouflage in cephalopods -- squid, cuttlefish and octopus -- who are masters of optical illusion.
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When marine biologist Roger Hanlon captured the first scene in this video, he started screaming. Hanlon studies camouflage in cephalopods -- squid, cuttlefish and octopus -- who are masters of optical illusion.