How is the goliath bird eating spider adapted to its environment?

As the name states, the Goliath is capable of eating small birds but that is rare. Also, it eats insects, some frogs, small snakes, small lizards, bats (rarely), other tarantulas, scorpions, mice, and rats.

And ironicly, it has to watch out for larger birds, larger snakes, larger mammals, and most of all, the tarantula hawk(which is a big wasp, not an actual hawk)