Wildlife, I sometimes find, comes in spurts. You can spend hours holding your binoculars and not seeing a single sparrow, then your thoughts wander or you scratch your head and suddenly one animal after another begins to appear. This was the case on the Burro Burro River, a couple of kilometers from Surama Ecolodge, on the edge of the Rupununi Savannah and bordering the Iwokrama Rainforest, where I was staying.