Many species breed repeatedly (assuming they survive long enough), but nevertheless have a specific breeding season. Thus, they have overlapping generations (see Figure 4.6d). Amongst the more obvious examples are temperate-region birds living for more than 1 year, some corals, most trees and other iteroparous perennial plants. In these, individuals of a range of ages breed side by side. None the less, some species in this category, some grasses for example, and many birds, live for relatively short periods.
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