Despite this evidence of decline, the Gouldian finch recently had its threat-status down-graded from 'Endangered' to 'Near Threatened' by the IUCN, based on estimates of current population size that suggest the population is stable or even increasing (Garnett et al. 2011).These estimates come from a series of ad hoc observations by bird watchers, and relatively few systematic surveys.. In other species, such as the Gouldian finch (Erythrura gouldiae), sperm morphometric values may show plasticity within the same breeding season if the social environment is modified. Males may produce an increased sperm midpiece size when in a highly competitive environment and an increased sperm tail length when competition is weak. 42
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