A perfect fossilized dinosaur footprint was discovered by a 4-year-old girl on a Welsh beach last week. Scientists say the print dates back to the Triassic period, and are calling it “the finest impression of a 215-million-year-old dinosaur print found in Britain in a decade.” Lily Wilder and her father, Richard, were taking a stroll along the beach in the Bendricks when Lily spotted the print. Initially, the Wilders thought the print was left behind by an artist, but it was in fact a real grallator, or a three-toed fossilized footprint, left behind by a bipedal theropod dinosaur. “We weren’t even sure it was real,” said Lily’s mother, Sally, on Jan. 30 in an interview with Wales Online. “I was imagining an artist had gone down and scratched it out, but I knew dinosaur footprints had been found along that piece of coast before so I just thought I’d ask …