Only 29 families of frogs are known, most of which were named by the mid-1800s. | لا تعرف سوى 29 عائلة من الضفادع، معظمها تم تسميتها بحلول منتصف القرن التاسع عشر.
Only 29 families of frogs are known and most were identified and described in the mid-1800s and the last in 1926. | لا تعرف سوى 29 عائلة من الضفادع ومعظمها تم تحديدها ووصفها في منتصف 1800s وأخيرة في 1926.