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Figure 6.24 Mountain lion cubs learn from their mothers how to survive in the wild. Generally, cubs stay with their mothers for about two years.
Figure 6.25 A grass snake guards her eggs.
Internal fertilization provides an advantage because more offspring survive as a result of embryo protection and parental care. However, internal fertilization requires more energy to find a mate. Some animals, such as the blue grouse (found in British Columbia) and the sage grouse (found on the Prairies), have complex mating behaviours that require large amounts of energy (Figure 6.26). Internal fertilization also results in the production of fewer zygotes compared with external fertilization.
Figure 6.26 Male sage grouses puff themselves and put on a lively dance performance to attract females. Such mating behaviour uses a great deal of energy.
Chapter 6 Meiosis is the basis of sexual reproduction. • MHR 211