Pozo Arenillas is a good introduction to the birds in Lima. The trip can be run almost anytime. A short trip to do very close to the airport. Perfect for a short trip to kill time. Especially good for North American waders, gulls and terns - September-April is the best time migrating birds, but there is always something to see.
Residents include Blackish and American Oystercatcher, Inca Tern, Belcher's and Gray-hooded Gull. It is also a great site for large flocks of altitudinally migrating Andean Gulls.
Nearby there are good spots for seeing Inca Tern upclose and for photography.