How does a nine-banded armadillo make itself buoyant enough to swim?

The nine-banded armadillo (Dasypus novemcinctus) is naturally dense due to its heavy carapace, which prevents it from floating under normal conditions. When the animal encounters a body of water, it has two primary methods for navigating it:

• Walking: It can simply walk along the bottom of the water while holding its breath.1
• Swimming: To achieve buoyancy, the armadillo gulps a sufficient amount of air into its digestive system, which allows it to float and swim across the surface.1