Extinction risk is widespread across the tree of life (1, 2). Therefore, a key goal of conservation biology is to identify predictors of species endangerment. The prevailing consensus that larger species are more likely to be threatened (3) was recently overturned by Ripple et al. (4), who demonstrate instead a U-shaped relationship between endangerment and body size among the world’s vertebrates—a conclusion with significant implications (5). However, we identify four problems with their conclusions. First, increases in endangerment of smaller vertebrates are heavily biased by a single class (Amphibia), which harbors the smallest tetrapods (6). Second, a U-shaped pattern found among amphibians themselves resulted from a biased subsample of this class. Third, these biases are exaggerated by improper phylogenetic analyses. Fourth, consideration of species’ geographic range sizes (GRS) alters the relationship between endangerment …

中文翻译：

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没有证据表明在最大和最小的脊椎动物中灭绝的风险会增加[生物科学]

灭绝风险是整个生命（树广泛的1，2）。因此，保护​​生物学的主要目标是确定物种濒危的预测因子。Ripple等人最近推翻了关于较大物种更有可能受到威胁的普遍共识（3）。（4），他们反而证明了世界脊椎动物在濒危与体型之间呈U形关系-这一结论具有重要意义（5）。但是，我们用其结论确定了四个问题。首先，小型脊椎动物的濒危性增加受到单一类（两栖类）的严重偏见，该类具有最小的四足动物（6）。第二，在两栖动物自身中发现的U形图案是由该类有偏见的子样本引起的。第三，不正确的系统发育分析会夸大这些偏见。第四，考虑物种的地理范围大小（GRS）会改变濒危之间的关系……