How doe cicadas know its been 17 years and its time to come out?

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Im sitting outside and their noises are deafening me. Got me thinking how do they know its their time to emerge? It’s not that they dig underground, set their apple watch for a 17 year time and roll out of bed when the timer goes off 17 years later. .what is their DNA to give this 17 year nap and know when that time is up?

In: Biology

3 Answers

Anonymous 0 Comments

They don’t hibernate, they dig little tunnels while underground and feed off of tree roots. As the trees age, their sap changes, and it is believed they detect the passage of time through the sap changes
In other words… the tree sap is their Apple Watch

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