The affix ṭhak comes after a word in the Accusative -2nd case in construction denoting birds, fishes or wild beasts, when the sense is 'who kills that'.,
Thus पक्षिणो हन्ति = पाक्षिकः 'a bird-killer'. The affix applies not only to the word-forms पक्षि &c, but to words denoting birds &c. (See (I. I. 68)). Therefore, we have forms शाकुनिकः, मायूरिकः, तैत्तिरिकः ॥ So also with मत्स्य, as, मात्स्यिकः, मैनिकः, शाफरिकः, शाकुलिकः ॥ So also with मृगः, as मार्गिकः, हारिणिकः, सौकरिकः, सारङ्गिकः ॥,