fˈiːmeɪlz ɡˈɪv bˈɜːθ tʊ ɐ sˈɪŋɡəl pˈʌp dˈʊɹɹɪŋ ðə nˈuː zˈiːlənd sˈʌmɚ dᵻsˈɛmbɚ ænd dʒˈænjuːˌɛɹi ænd pɹəvˈaɪd sˈoʊl kˈɛɹ fɔːɹ ðɛɹ jˈʌŋ, ɡˈæðɚɹɪŋ wɪð ˈʌðɚ fˈiːmeɪlz ɪn mətˈɜːnᵻɾi ɹˈuːsts ʌv ˌʌp tə wˈʌnhˈʌndɹɪd twˈɛnti ˌɪndᵻvˈɪdʒuːəlz; smˈɔːl nˈʌmbɚz ʌv ɐdˈʌlt mˈeɪlz ænd nˈɑːnɹᵻpɹədˈʌktɪv fˈiːmeɪlz ɑːɹ pɹˈɛzənt ɪnðə ɹˈuːsts æz wˈɛl.
Females give birth to a single pup during the New Zealand summer (December and January) and provide sole care for their young, gathering with other females in maternity roosts of up to 120 individuals; small numbers of adult males and non-reproductive females are present in the roosts as well.