Tadpole development takes about 70 days and metamorphs measure 20 mm and resemble the adult, however thigh colouration does not become apparent until about 1 week later.
The passage describes the developmental stages of a tadpole, highlighting that it takes approximately 70 days for development to complete, with metamorphosis measuring 20 millimeters and resembling an adult form. However, thigh coloration is only visible after one week.