Krill chase whales and try to tag them with ribbons.
Whales try to avoid the krill whilst travelling between the feeding and breeding grounds.

Krill can only move when they hear The Bloop.
Whales are navigating by sonar.

Neither can talk underwater...

npugh.co.uk/tag/the_bloop/
barg.org.uk/make/programme_for_enter_the_arena/

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