Australian scavengers don’t just eat everything and slink away. They approach a carcass like a buffet

While many people imagine scavengers as mindless eaters who consume any available carcass, new research challenges this notion. When scientists examine scavengers, they realize that a dead animal contains multiple macronutrients, much like a meal with protein-rich white and fat-rich yolk. Carnivores, such as dingoes, eagles, and foxes, exhibit more discerning eating habits than previously believed.

To investigate their feeding choices, scientists monitored 40 eastern grey kangaroo carcasses in New South Wales over summer and winter, using camera traps to record activity. The three dominant scavengers in this region were identified as dingoes, eagles, and red foxes. The study found that eagles predominantly targeted the head and abdomen of the kangaroos, while dingoes frequently fed on the tail.

Foxes, however, were outcompeted by the other scavengers and primarily consumed leftovers. Apex scavengers, such as dingoes and eagles, are usually the first to arrive at a carcass site, enabling them to consume large amounts of biomass swiftly. As the primary scavengers, they consumed preferred high-fat parts, leaving limited resources for foxes.

Over time, scavengers adjusted their preferences based on the carcass's composition, with eagles shifting their focus to protein-rich hindlimbs. Seasonal changes, such as cooler temperatures and limited food alternatives, increased the importance of fats in scavengers' diets. This research highlights that scavengers make informed decisions about what to eat from a carcass, prioritizing fat-rich areas initially before shifting to other parts.

The availability of these preferred parts depends on who arrives first, resulting in complex interactions among scavengers at a buffet-like carcass site.