Arthropods such as crustaceans often have parts of their exoskeleton made of keratin, sometimes in combination with chitin.
ɑ ɹ θ ɹ ə p ɑ d z WORD_BOUNDARY s ʌ t̠ʃ WORD_BOUNDARY ʌ z WORD_BOUNDARY k ɹ ʌ s t eɪ ʃ ə n z WORD_BOUNDARY ɔ f ə n WORD_BOUNDARY h æ v WORD_BOUNDARY p ɑ ɹ t s WORD_BOUNDARY ʌ v WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY ɛ k s oʊ s k ɛ l ɪ t ə n WORD_BOUNDARY m eɪ d WORD_BOUNDARY ʌ v WORD_BOUNDARY k ɛ ɹ ʌ t ɪ n WORD_BOUNDARY s ʌ m t aɪ m z WORD_BOUNDARY ɪ n WORD_BOUNDARY k ɑ m b ɪ n eɪ ʃ ə n WORD_BOUNDARY w ɪ ð WORD_BOUNDARY t̠ʃ ɪ t ɪ n WORD_BOUNDARY