He smelled an iguana hiding in the grass. Before Hurricane Irma the place was overrun by iguanas but they lost a lot of habitat and now it's coming back their population seems to be growing as well, worse luck. They are terrible predators with no natural enemies.
He traced it to the gap underneath the power pole, a perfect hiding spot. Rusty worried at the space from different angles for quiet a while.
He used to be a fierce hunter but regular food as much as he wants has dulled the edge of his killer instinct these days.
I think once upon a time he survived by eating what he caught. These days his life is a good bit softer. No regrets.