Kautilya's Arthashastra 2.2.10

2.2.10

nāgavanapālā hastipakapādapāśikasaimikavanacarakapārikarmikasakhā hastimūtrapurīṣacchannagandhā bhallātakīśākhāpracchannāḥ pañcabhiḥ saptabhir vā hastibandhakībhiḥ saha carantaḥ śayyāsthānapadyāleṇḍakūlaghātoddeśena hastikulaparyagraṃ vidyuḥ //

Guards of elephant forests, assisted by those who rear elephants, those who enchain the legs of elephants, those who guard the boundaries, those who live in forests, as well as by those who nurse elephants, shall, with the help of five or seven female elephants to help in tethering wild ones, trace the whereabouts of herds of elephants by following the course of urine and dungs left by elephants and along forest-tracts covered over with branches of Bhallátaki (Semicarpus Anacardium), and by observing the spots where elephants slept or sat before or left dungs, or where they had just destroyed the banks of rivers or lakes. They shall also precisely ascertain whether any mark is due to the movements of elephants in herds, of an elephant roaming single, of a stray elephant, of a leader of herds, of a tusker, of a rogue elephant, of an elephant in rut, of a young elephant, or of an elephant that has escaped from the cage.