It usually gets out of its hole for finding food after every tide just goes out.
It always gets into its hole 10 minutes in advance when next tide comes in again.
Its just later 50 minutes than last day when the small crab gets into its hole everyday.
seasonal changes forms when the earth moves a circle around the sun.
Each change is periodical and rhythmical, which is called seasonal rhythm of nature.
Some animals can form a rhythmical action with the seaconal changes,
e.g. birds migration, the hibernation of snake or frog
a rhythm which man can not see in nature---gravitational rhythm
caused by relative movements between the earth and any of other celestial bodies
All of matters in nature are attracted by the gravitation from the moon.
So, gravitational rhythm from the moon should belong to a natural rhythm.
e.g. womans menstrual rhythm.
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2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26
2016-02-26