A number of causes are believed to be involved, including habitat destruction and modification, over-exploitation, pollution, introduced species, global warming, endocrine-disrupting pollutants, destruction of the ozone layer (ultraviolet radiation has shown to be especially damaging to the skin, eyes, and eggs of amphibians), and diseases like chytridiomycosis.
ɐ nˈʌmbɚɹ ʌv kˈɔːzᵻz ɑːɹ bᵻlˈiːvd təbi ɪnvˈɑːlvd, ɪŋklˈuːdɪŋ hˈæbɪtˌæt dᵻstɹˈʌkʃən ænd mˌɑːdɪfɪkˈeɪʃən, ˌoʊvɚɹɛksplɔɪtˈeɪʃən, pəlˈuːʃən, ˌɪntɹədˈuːst spˈiːsiːz, ɡlˈoʊbəl wˈɔːɹmɪŋ, ˈɛndoʊkɹˌaɪndɪsɹˈʌptɪŋ pəlˈuːtənts, dᵻstɹˈʌkʃən ʌvðɪ ˈoʊzoʊn lˈeɪɚ ˌʊltɹɐvˈaɪəlɪt ɹˌeɪdɪˈeɪʃən hɐz ʃˈoʊn təbi ɪspˈɛʃəli dˈæmɪdʒɪŋ tə ðə skˈɪn, ˈaɪz, ænd ˈɛɡz ʌv æmfˈɪbiənz, ænd dɪzˈiːzᵻz lˈaɪk tʃˌaɪtɹɪdɪˌɑːmɪkˈoʊsɪs.