If there are 60 sharks in Pelican Bay, and this number is twice the number of Pelicans that usually live in Shark Bite Cove, then there were 60/2=<<60/2=30>>30 Pelicans in Shark Bite Cove.
If one-third of the Pelicans in Shark Bite Cove move to Pelican Bay,
then 30/3=<<30/3=10>>10 Pelicans will have moved away.
This would leave 30-10=<<30-10=20>>20 Pelican remaining in Shark Bite Cove.
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