Earthworms
Earthworms in Summer
In summer as the soil heats and dries, worms spend more time below except after rain. Robins have to work harder to find them on hot summer days than they did in spring. But nights are cooler and moister than days, and so that's when worms emerge. Some are still up when robins wake in the early morning twilight, and that is why the early bird catches the worm.
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