Editor:
A question for Barry Evans ("Frigate Birds," April 19): How was it possible to discover that Frigate birds, flying for weeks without touching land or water, sleep alternatively with one half and then the other half of their brains? You also mentioned their diet of flying fish, but I have observed their spectacular talents at snatching fish from less acrobatic birds. Those fish were not flying voluntarily.
Don Garlick, Fieldbrook
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