SB 3.10.23

kharo ’śvo ’śvataro gauraḥ
 śarabhaś camarī tathā
ete caika-śaphāḥ kṣattaḥ
 śṛṇu pañca-nakhān paśūn
Synonyms: 
kharaḥ — ass; aśvaḥ — horse; aśvataraḥ — mule; gauraḥ — white deer; śarabhaḥ — bison; camarī — wild cow; tathā — thus; ete — all these; ca — and; eka — only one; śaphāḥ — hoof; kṣattaḥ — O Vidura; śṛṇu — just hear now; pañca — five; nakhān — nails; paśūn — animals.
Translation: 
The horse, mule, ass, gaura, śarabha bison and wild cow all have only one hoof. Now you may hear from me about the animals who have five nails.