ðeɪ ɑːɹ tˈɪpɪkli sˈɑːlətˌɛɹi nɑːktˈɜːnəl ˈænɪməlz, ɹˈaɪflɪŋ θɹuː bˈɑːɾəm sˈɛdɪmənts ɪn sˈɜːtʃ ʌv fˈuːd æt nˈaɪt, bˌʌt ɑːɹ ˈɔfən ɡɹɛɡˈɛɹiəs dˈʊɹɹɪŋ ðə dˈeɪ fˈɔːɹmɪŋ lˈɑːɹdʒ sˈɛdəntɚɹi ɡɹˈuːps.
They are typically solitary nocturnal animals, rifling through bottom sediments in search of food at night, but are often gregarious during the day forming large sedentary groups.