ðeɪ kæn vˈɛɹi kənsˈɪdɚɹəbli, bˌʌt jˈuːʒuːəli mˈætʃ ðə sˈɔɪl ɔːɹ ɹˈɑːk kˌʌlɚɹˈeɪʃən ʌv ðɛɹ nˈeɪɾɪv hˈæbɪtˌæts tə sˈɜːv æz kˈæməflˌɑːʒ.
They can vary considerably, but usually match the soil or rock coloration of their native habitats to serve as camouflage.