Young burying beetle larvae may not possess muscles powerful enough to chew the food, so mother chews the food and feeds it to the brood. She may care for some larvae who are not her own. In studies of contested carcasses, German scientists* found that the vast majority of the offspring belong to the female winner and very few belong to the loser. The loser is often small and unlikely to win a battle. Her alternatives may be producing a few offspring on the carass won by another female or none. The optimal reproductive strategy is to slip eggs into the brood of another female.
*JOSEF K. MULLER, ANNE-KATRIN EGGERT & JURGEN DRESSEL. 1990. Intraspecific brood parasitism in the burying beetle, Necrophorus vespilloides. Anita. Behav. 40: 491-499.