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Earthworms come out in the rain to regulate their breathing. They breathe through their skin, which requires them to be moist at all times. Too much water can suffocate them, however.
During rainy weather their burrows usually fill up with water, prompting them to find an area that's moist but not drenched.

Why Do Earthworms Surface After Rain? - AccuWeather

www.accuweather.com/en/weather-news/why-do-earthworms-surface-afte/28916

Apr 12, 2013 ... Earthworms often come to the surface to escape moles. "Rain ... "Similar to how earthworms move upwards and out of the way when predator ...

Frequently Asked Questions About Earthworms - Annenberg Media

www.learner.org/jnorth/search/WormNotes3.html

Q. Why do earthworms stay underground and seldom come out of the soil? ... After rain or during high humidity are safe times for worms to move around without ...

Why Do Earthworms Surface After Rain? - Scientific American

www.scientificamerican.com/article/why-earthworms-surface-after-rain/

Apr 14, 2011 ... Earthworms often come to the surface to escape moles. "Rain ... "Similar to how earthworms move upwards and out of the way when predator ...

Why Do Worms Surface After Rain? | Mental Floss

mentalfloss.com/article/50786/why-do-worms-surface-after-rain

May 31, 2013 ... Earthworms breathe by passing oxygen and carbon dioxide through their skin. ... Moisture in the ground keeps the mucus from drying out, so soil that's a little ... it rained during the day, but had to come up sooner if it rained at night. ... as soon as the rain stops, and many do make it back underground before ...

Why do earthworms come out after rain? - Kiwi Conservation Club

www.kcc.org.nz/why-do-earthworms-come-out-after-rain

An earthworm breathes oxygen by absorbing it through its moist skin. ... damp soil, but if the rain is very heavy, the oxygen in the water-logged soil may run out.

Why do worms come to the surface when it is raining

scienceline.ucsb.edu/getkey.php?key=3276

The reason why earth worms come up to the surface of the soil when it rains is ... live underground, where they are protected from the sun and so won't dry out. ... If the worms do not come to the surface during a heavy rain, they will suffocate.

Why Do Earthworms Come Out When it Rains? - The Farmer's Life

thefarmerslife.com/agchat/why-do-earthworms-come-out-when-it-rains/

Apr 16, 2013 ... I've always wondered why earthworms come out of the ground when it rains. I don't know about you but after a rain I can always find them on ...

www.ask.com/youtube?q=Why Do Earthworms Come Out in the Rain?&v=gPbYhuggR04
May 21, 2013 ... May 21, 2013; 5:00 AM ET After a heavy rain, earthworms can be seen on roads and sidewalks, but the reason may surprise you.

Science of the Everyday: Why Earthworms Surface | Popular Science

www.popsci.com/scitech/article/2008-03/science-everyday-why-earthworms-surface

Mar 12, 2008 ... Youve certainly seen flocks of the orange-breasted birds out on a wet lawn ... scene; but why exactly do the worms come out when it rains and expose ... which means we're getting a lot of rain and the robins are out in force.

Popular Q&A
Q: Why do earthworms come out of the ground when it rains
A: Worms breath with their skin, when it rains out, the ground floods ... ...MORE... Read More »
Source: www.chacha.com
Q: Why do earthworms come up out of the ground when it rains?
A: Simple, really, say some researchers. Earthworms breathe air, justlike we do. They CAN breathe water (they breathe through their skin),but not for long periods ... Read More »
Source: www.arcamax.com
Q: Why do they come out in the rain?
A: because they dont come out in the sun or snow Read More »
Source: wiki.answers.com
Q: Why do frogs come out in the rain?
A: well, frogs do not come out in the rain, toads do. They need the moisture the rain provides. Next time you see one feel its back. it should be bumpy. Read More »
Source: wiki.answers.com
Q: Why do worms come out after it rains?
A: Go outside near any patch of dirt on a warm summer afternoon after a rainfall, and you are sure to find plenty of earthworms on driveways and sidewalks. Scienti... Read More »
Source: www.answers.com