Wildlife authorities are appealing for information after two pelicans were shot with arrows in Mandurah last week.

In the first incident, an adult pelican was put down after being found with a target arrow through its chest at Soldier's Cove on May 20.

A second adult pelican was found with a hunting arrow through both wings in nearby Samphire Cove on May 26.

The Department of Environment and Conservation's wildlife officer Emma Lipianin says that bird is expected to survive.

"The arrow didn't pierce any vital organs or bones so it basically got very lucky and avoided serious injury," she said.

Ms Lipianin says those responsible face hefty penalties.

"To kill or injure a pelican or any protected fauna under the wildlife conservation act carries a maximum penalty of $4,000," she said.

"That can be increased for specially protected fauna to $10,000.

"And, then the RSPCA has offences under their animal welfare act which carry a maximum penalty of $50,000 and a five year jail term so it's not only inhumane and cruel, it's also illegal."

The DEC is urging people who have information about the attacks to contact its helpline on 9474 9055.

Four other animals have been shot at with guns or arrows in recent weeks.

In one incident, vets removed 23 pellets from a horse after it was shot with a gun in Anketell.

Other attacks include a pet dog being shot with a bow and arrow at a Kununurra property, and a kangaroo being shot in Toodyay.

The attacks led to the The RSPCA calling for bow and arrows to by banned in WA.

Ms Lipianin says members of the public can help by reporting suspicious behaviour around animals.

"We just don't have the resources to patrol all areas in case someone may or may not shoot [animals]," she said.

"So if someone does see something suspicious they could contact the DEC helpline, or if they see people with weapons [they could] contact Crimestoppers."