Assertion: spadefoot's egg | /r/HasProperty | nussbaum et al.
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Source sentences:
text: Typical clutches in Colorado contain 3000 to 9000 eggs (mean of 5200 eggs), although in the Pacific Northwest clutches of 12,000 eggs are considered normal, and may reach 16,000 eggs (Nussbaum et al. 1983, Koch and Peterson 1995, Hammerson 1999).