I think perhaps one of the best examples of this is in the Amazon rainforest. You have two of the apex predators being the Jaguar and the Anaconda.
Now there are fully documented duels between these two with the Jaguar holding a lead in wins but success is by no means a certainty and these two tend to avoid each other because there are easier meals around.
Jaguars tend to concentrate on easier meals though the legendary ‘Scarface’ has developed a great hunting technique for caiman (a relative of the crocodile).
Source: Nick Nicholas