Ключевые слова: aircraft carrier, animal behavior, behavior, bird watching, birding, birds, birdwatchers, boarding ship, border, border crossings, deck, ecology, free travel, illegal, lose strength, migrants cross sea, migration patterns, migration problems, nature, ornithology, passenger, philomachus pugnax, problems, problems migrants, ruff, sail, sandpipers, sea, ship, sneaky, tired, waders, weaken,