One man put a new twist on bestiality Sunday afternoon when he sexually assaulted a dinosaur - a large, plastic one - in a Chester County park, according to police.

The unidentified man followed two teen girls - 13 and 14 - into Pomeroy Park in Avondale around 4:30 p.m. and first exposed his penis to them before he began "simulating a sexual act with a large plastic dinosaur in the park," according to a state police news release.

The man, who is described as Hispanic, between 20 and 30 years old and around 5-foot-6 with a goatee, fled the scene on his bicycle, according to police.

A state police spokesman did not return calls for comment Monday. It was not immediately clear from the release if the dinosaur was a permanent fixture in a play area of the park.

Anyone with information is urged to call state police at 610-268-2022.