Kaśyapa, the grandson of ब्रह्मा and son of मरीचि married eight daughters of दक्षप्रजापति and one of them क्रोधवशा delivered ten daughters. Monkeys and lions were born from हरी , one of those ten daughters. Thus they are brothers, and both are called 'hari'. (Vālmīki Rāmāyaṇa, Araṇya Kāṇḍa, Canto 14, Verse 24)