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I have to challenge both ideas. First, I learned to swim without any instruction, basically from being pushed into the deep part of the creek by the bigger kids. Of course I got better with practice, but I've never had any sort of formal instruction. Second, not all animals can swim. I have two dogs: one swims like a seal (and has since I got him at ...


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Dreams are simulations created by the brain in order to train us to cope with challenging situations. Most of the dreams present situations where the individual is confronted with challenges or risks he/she might face during the life. Evolutionary concept of dream suggests that its a way by which brain try to notify some risks and train us to invade through ...


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Richard Dawkins discusses this in his book The Greatest Show on Earth: The Evidence for Evolution. The birds, in the aforementioned example Starlings, 'know' which direction to fly and where to be by obeying simple local rules concerning the distance and spacing of other members of the flock in their immediate vicinity, without any global knowledge of the ...


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I don't know about the specific cues that American robins use for migration. This species is also both a short range (e.g. between states or to lower altitudes) and long range migrant (e.g. Florida & Mexico), so the cues that they use can probably differ between overwintering populations. There are also year-round populations of robins in the US, but ...


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I'm not a specialist in this area, but I would guess that the length of day-light periods compared to night time could be a good trigger. This is quite independent of the weather, is quite constant (even though length of days is known to have changed through over the millions of years past since the formation of earth).



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