In Red-eyed Vireos the pterylae darken by the end of the first day and the quills break through the skin on the fifth day, erupting from the sheaths by the seventh day (Lawrence, 1953:67). [Please select]
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The physiological stimulus of the erupting tooth is capable of causing a painful irritation of the gum, so that the child is said to suffer from teething, accompanied, it may be, and the association is significant, by "teething convulsions." [Please select]
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