First, a disclaimer:  I know next to nothing about birds, let alone birds in Lima.  I can identify cuculis — those fat, grey pigeons that constantly hump in the trees — and hummingbirds and seagulls, which you can spot in various parts of the capital, but other than that, I couldn’t  begin to tell you who all those strange-looking birds are that flap around my backyard. All I know is that, like waves of tourists in Peru, some birds appear in the spring, others in the fall, and there are slews of them. Which is why I wasn’t surprised when a local birding expert informed me recently that Peru is a serious…