Black Caracara's are opportunistic eaters. From insects to small birds and even fish or small lizards. Sometimes they even eat the eggs from small birds. This is the reason why they are not welcome near small birds. The moment they are near flycatchers, tanagers or martins, they all take turns and try to chase away the Caracara by diving as low as possible right above their head.
The Black Caracara usually isn't bothered by their attack but if it continues for a long period of time, they will move away to a quieter place.
This is an ongoing battle between them. For us as onlookers, they give quite a show. The challenging part for us is trying to take a photo of both of them in action. It was not easy.