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Birds and reptiles cry similar tears to humans, says new research - CNN
Aug 13, 2020 42 secs

The researchers also looked at the crystallization patterns that form when tears dry out, which can give insight into variations in tear types and even reveal certain types of eye disease.

"Although birds and reptiles have different structures that are responsible for tear production, some components of this fluid (electrolytes) are present at similar concentrations as what is found in humans," added Oriá in a press release.

"But the crystal structures are organized in different ways so that they guarantee the eyes´ health and an equilibrium with the various environments."

Despite similar tear composition across species, surprisingly the crystal structures showed greater variation.

The crystal structures in sea turtle and caiman tears were the most distinctive, likely a product of adapting to their aquatic environments.

Environment is key

Tear research also gives scientists important insight into the health of animal habitats and pollution levels.

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