. Mar Apr Mai^ Jun Jul Aug Sep Oct Nov Dec Jan Fig. 66. Catches of Sperm, Blue and Fin whales. Natal. is during this southern journey, and that the chief time for parturition occurs when the whales are to the south of Natal, and that both seasons are practically over before the return migration in the following March, April and May. If this really is so, it forms a striking contrast to the Whalebone whales in which the breeding migration takes place in the opposite direction towards the north; but it must be remembered that the southern movement of Sperm whales may merely be a spreading of the
. Mar Apr Mai^ Jun Jul Aug Sep Oct Nov Dec Jan Fig. 66. Catches of Sperm, Blue and Fin whales. Natal. is during this southern journey, and that the chief time for parturition occurs when the whales are to the south of Natal, and that both seasons are practically over before the return migration in the following March, April and May. If this really is so, it forms a striking contrast to the Whalebone whales in which the breeding migration takes place in the opposite direction towards the north; but it must be remembered that the southern movement of Sperm whales may merely be a spreading of the population from warmer waters where large numbers may remain, so that parturition may be occurring
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