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Updated: May 8, 2025
Then just as we were wondering what else could happen, one night, without the slightest warning, the very birds migrated from the lagoon, carrying away with them the promise of future pillows, to say nothing of a mattress, and the Maluka was obliged to go far afield in search of non-migrating birds.
The egg is exposed to many dangers before hatching, and the young bird is especially tender, defenceless, and helpless. Whole flocks of adult and strong-winged tribes are killed by hail. Severe winters are usually followed by a sensible diminution in the numbers of the non-migrating birds, and a cold storm in summer often proves fatal to the more delicate species.
Among our own birds it has been found that the "migratory species evince a greater amount of individual variation than do non-migrating species" because they are subject to more varying conditions of food and climate.
There is a theory held by many naturalists that the migrating instinct dates back to the glacial period. According to this theory North America was inhabited originally by non-migrating birds. Then the great Arctic ice-cap began to move southward and the birds were forced to flee before it or starve.
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