Pelicans eating Gannets?

I have just watched an BBC documentay "Life" on animal behaviour and saw something that I never expected: Pelicans eating gannets!

This incident was filmed off the coasts of South Africa. Changes in ocean currents and melting of glaciers at the poles have caused fish stocks to decrease, and forced many seabirds to hunt beyond their usual hunting grounds and over their limits. With no fish to feed their newborn chicks, great white pelicans have to find an alternative food source. Cape gannets, meanwhile, were forced to abandon their chicks to look for food in the open ocean. The pelicans have reached the gannets' breeding grounds and swallowed entire chicks down their gullets. Back at the nest, the pelican parents spit out half-digested gannet chicks for their own chicks to devour. This is a perfect example of animals being pushed to the extreme due to man's impacts on the environment.

"Life", could be considered as the sequel for globally-acclaimed documentaries, "The Blue Planet" and "Planet Earth". Where the previous works focused on habitats, this one is devoted to organism behaviour. It showcased extraordinary behaviour of organisms that people hardly ever imagined, from sengis creating a racecar track to avoid predators, to pebble toads rolling down mountains to dodge tarantulas. Filmed entirely in High-Defenition, it is a must-watch for all nature lovers.

This is a segment of the fifth installment, "Birds", which shows the pelicans and the gannets. Enjoy! :D

For more information on this documentary: http://en.wikipedia.org/wiki/Life_(BBC_TV_series)