Here's why:
* Family: In biological classification, a family is a taxonomic rank that groups together closely related genera.
* Macropodidae: This family specifically encompasses all kangaroos, wallabies, quolls, and other related marsupials. They share common characteristics like their powerful hind legs, large feet, and a strong tail used for balance and hopping.
Therefore, the term "macropodidae" simply refers to the family that kangaroos belong to. It's like saying "canidae" for dogs or "felidae" for cats - it designates the specific family group.