Untitledminute after it escapes from the egg.Very beautiful is the way in which many birds, like our commonchaffinch, disguise the outside of their nest with moss and lichen andother trifles felted together, so that the cradle is as inconspicuous aspossible. There seems to be a touch of art in fastening pieces ofspider's web on the outside of a nest!How curious is the case of the tree-sloth of South American forests,that walks slowly, back downwards, along the undersides of the branches,hanging on by its long, curved fingers and toes. It is a nocturnalanimal, and therefore not in special danger, but when resting during theday it is almost invisible because its shaggy hair is so like certainlichens and other growths on the branches. But the protectiveresemblance is enhanced by the presence of a green alga, which actuallylives on the surface of the sloth's hairs--an alga like the one thatmakes tree-stems and gate-posts green in damp weather.
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Sir Isaac Newton, sugary sap, wingless larval stage, South American forests