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Of course, boats come to Liverpool from all over the world. And often clinging on to their hulls under the water are little stowaways - marine hitchhikers. Bill Oddie finds some Korean sea squirts growing on a submerged length of rope. Sea squirts are very basic animals - a hole at one end, a hole at the other and a sieve in the middle. If they feel threatened, they close the hole up and squirting out water – hence the name. An incredibly simple design, but like many simple things, incredibly successful. Sea squirts are very common marine animals, found all over the world. Korean sea squirts, as you might imagine, come from the Far East.