Investigations have been launched after birds were allegedly poisoned at a reserve on Auckland’s North Shore earlier this week.

Images seen by 1News showed several pūkeko and pigeons lying dead at Sherwood Reserve in Browns Bay on Monday evening.

Auckland Council said it became aware of the incident following complaints it had received from the public.

A contractor visited the site on Tuesday morning and found no unusual substances on the ground. They removed one dead bird from the site, park and communities facilities head of area operations Julie Pickering said.

“At this stage, we unable to comment on whether birds have been deliberately harmed at the reserve.

“We will continue to monitor the site to check on the health of birds and for any unusual behaviour.”

Department of Conservation Tāmaki Makaurau operations manager Rebecca Rush said that two pūkeko were taken to a bird rehabilitation centre and have since died.

A Biosecurity NZ spokesperson said it sent the pūkeko to a laboratory for necropsy and sampling.

It said its role was to determine if an exotic disease was involved in the deaths of the birds, considered to be a very low risk.

Botulism or toxic algal blooms are often the culprits behind large numbers of bird deaths.

SPCA inspectorate team leader Andre Williams confirmed it is investigating a complaint relating to several unwell and deceased birds in Browns Bay.

“As this is an active investigation, we are unable to comment further.”

Police said it received information on Monday night regarding several animals becoming unwell at Sherwood Reserve.

“The caller was advised in the first instance to contact Auckland Council and SPCA,” a police spokesperson said.