Any large, aggressive frog; the male American bullfrog (Lithobates catesbeianus) is 9–15 cm long, and male African bullfrogs (Pyxicephalus adspersus) can grow to more than 20 cm long (females are smaller in both species).
Mike Allaby
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。