PORTO JOFRE, BRAZIL - SEPTEMBER 29: A jaguar stalks and kills a yellow anaconda on the Cuiaba River in the Pantanal in Mato Grosso, Brazil. The cat spotted the snake resting on the riverbank and chased it into the shallow waters at the river's edge before struggling with it for over two minutes on the morning of the 29th of September, 2017. Anaconda kills by jaguars have only been observed on a handful of occasions and very few photographs of this incredibly rare behaviour are known to exist.  Brunskill has spent a month observing the jaguars of the Brazilian Pantanal and last week his patience was rewarded when a jaguar captured a caiman.  (Photo by Chris Brunskill Ltd/Getty Images)