The Judicial Magistrate Court in Perumbavoor sent Ameerul Islam to police custody till 4.30 PM tomorrow in connection with the case, police said.
His custody was sought by police in Kuruppampady in Perumbavoor.
According to police, Ameerul, a migrant worker from Assam, had confessed during questioning that he had engaged in sexual activities with animals near the lodge where he used to stay in Kuruppapady police station limits.
Ameerul was booked by police under various sections, including unnatural offence and cruelty against animals after the animal's owner lodged a complaint against him.
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The incident occurred in February.
Ameerul was arrested last month for the rape and brutal murder of the Dalit woman who hailed from a poor family on April 28.
He was arrested on the charge of killing the law student, 50 days after the incident, that had become a major issue in the Kerala Assembly elections in May.