Why Crocodiles Cry While Eating and the Science Behind It

People have long told others to stop shedding crocodile tears when doubting their sincerity, but the phrase raises an obvious biological question about whether heavy reptiles actually feel regret over their meals. Le Tribunal du Net reported that scientists finally tested the old myth on the ground rather than just repeating it.

Did scientists test the reptile tears?

They observed four caimans and three alligators, which are close cousins of the crocodile, trained to feed on dry land. Most of the animals produced tears during their meals, with some even forming bubbles and foam at the corners of their eyes.

Sadness has nothing to do with the physical reaction, however. When a reptile clamps down on food, it shows zero remorse, according to Kent Vliet. The biological trigger instead hides inside the animal’s sinus system.

What causes the biological reflex?

Researchers outlined two main mechanical explanations for the eye-watering feeding sessions. As the animals hiss and blow air through their sinus passages while eating, the forced air can stimulate their lacrimal glands and push liquid toward the eye like a pump.

The second possibility is purely mechanical, involving the sheer pressure of jaw muscles squeezing the tear glands when the jaws close on prey. The animal is essentially being wrung out rather than crying from sorrow.

The study itself actually originated partly from a distinct human medical condition. Known as Bogorad syndrome or the “crocodile tear syndrome,” a physician first described the ailment in 1926 as a rare consequence of Bell’s palsy.

When facial nerves regenerate incorrectly, the body crosses its wiring so that the signal meant for salivation triggers the lacrimal glands instead. Humans affected by this condition weep over their plates without any sadness — one name for two situations, and in both cases it is a matter of plumbing.

Which myths surround the behavior?

Several persistent beliefs about reptile tears collapse under scientific scrutiny. One common myth claims that the creatures cry simply to soften up their victims before eating them, but the moisture links directly to the physical act of eating rather than any deliberate strategy.

Another misconception suggests the phrase stems from ancient scientific observations, while the legend actually circulated widely long before anyone bothered to sit down with alligators and a notebook in 2006.

The research also focused specifically on caimans and alligators rather than crocodiles in the strict sense. The authors maintained strict scientific caution, avoiding broad generalizations across every single species in the wider family.