Reptiles have less efficient kidneys than mammals and they can’t
produce urine with a higher salt concentration than the seawater they
drink. To avoid poisoning themselves with salt buildup, sea
turtles have
a gland in each eye that actively pumps salt ions into their tears.
They need to run these glands continuously to maintain the correct
balance of salt in their bodies.
We associate crying with egg laying because that’s the only time they
come ashore, but they cry in the sea as well. The tears also help flush
sand from their eyes.
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