Dear Dr. Bob: Please describe the cow's digestive system. -- B.M., St. Augustine. Response: The bovine digestive system, also known as the gastrointestinal tract, is amazing. Along with camels ...

The digestive system is fundamentally the process which is responsible for how animals obtain nutrition from food.

But why do animals repose in the way that they do? Previous hypotheses posit that the shape and location of the animal’s digestive system influences the position in which they relax.

The tough little egg made it all the way through the digestive system of a coscoroba swan like this one. TonyBaggett / iStock Killifish eggs are known for their resilience: They’ve been found ...