Wildlife authorities and police are investigating the mysterious deaths of hundreds of short-tailed shearwater birds in Hobart.
The seabird carcasses were discovered last week at Cameron Bay near the suburb of Berriedale.
Tasmania's wildlife and parks department has called for anyone with information to come forward.
"The matter is being investigated with support from Tasmania Police," the department said in a statement on Wednesday.
"Killing or interfering with native wildlife is illegal in Tasmania unless a person has the relevant licence or permit. Significant penalties apply for wildlife offences."
People convicted of aggravated cruelty under the Animal Welfare Act face fines up to $34,000 and up to five years' jail.
Penalties under other acts and regulations may also apply.