Cruel attacks on pelicans in Mandurah in the past week have left one pelican dead and another injured.
The Department of Environment and Conservation is appealing for information from the public following two separate attacks on pelicans that were shot with arrows.
On May 20, an adult pelican was found at Soldiers Cove near the new Mandurah estuary bridge with a target arrow through its chest.
A WA Seabird Rescue volunteer retrieved the bird, which had to be euthanased due to severe internal injuries.
On the following Sunday, May 26, an adult pelican was found shot through both wings with a hunting arrow at nearby Samphire Cove.
A WA Seabird Rescue volunteer also retrieved this bird, which is being rehabilitated.
DEC wildlife officer Cameron Craigie said the attacks were being investigated by DEC, WA Police and the RSPCA.
"Using animals like pelicans for target practice or hunting is something that is not only illegal, it is inhumane and cruel," he said.
"The pelican shot on Sunday is extremely lucky to have survived as the arrow has not caused significant damage to any bones or vital organs.
"The Mandurah Coastal Vet and Pet Care Centre and volunteers at WA Seabird Rescue have done a great job to assist with the pelican's recovery, and it is now being rehabilitated before being returned to the wild."
Pelicans are protected and anyone who injures or kills one could be fined up to $4000 under the Wildlife Conservation Act as well or up to $50,000 and a five-year prison term under the Animal Welfare Act for cruelty offences.
These attacks follow similar attacks on dogs, horses and kangaroos throughout the year.
Anyone with information about the attacks can contact DEC's Wildcare Helpline on 9474 9055.