Controlled Natural Selection And Value Marking

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Swans are probably the least liable to attack, because of their pugnacity and great strength.
In the majority of insects, the copulatory period is often prolonged for many hours or even days ; during this long period the pairs are in a helpless condition, able only to make feeble attempts to escape from danger. In many species, the male rests on top of the female, as it were guarding her and often 70 CONTROLLED NATURAL SELECTION carrying her in flight. In other species, the pairs unite end to e
...nd ; in these cases, other methods encouraging the taking of the male are utilised, as will be shown later. But although it seems that when thus united, an enemy would chance to take male and female equally, in many cases, owing to the position in space occupied by the copulating pair, this is not so ; for instance, in some cases the male clings to a grass stem or other support, whilst the female dangles below ; a bird taking such a pair will strike first where the insect joins the grass, having learnt by experience that of insects, this, the head end, is the most vulnerable part ; the bird will seize the male, the female becoming unjoined wiU be likely to escape.

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