Female hen harrier © James Leonard

When a young female hen harrier known as 254843 took her first flights over the moorlands of Otterburn, Northumbria, in July 2024, she became part of a vital conservation effort. Fitted with a satellite tag by Natural England (NE), this small device would help scientists track her journey, monitor her wellbeing, and contribute to the protection of one of the UK’s most threatened birds of prey.

But just weeks later, her signal stopped. What initially appeared to be a tragic but natural loss of a young bird soon revealed something far more sinister and set in motion a remarkable multi-agency investigation into suspected wildlife crime.

From Conservation Monitoring to Crime Scene

When NE staff noticed that 254843’s satellite tag had stopped transmitting, they followed established procedures to locate her. The bird’s remains were found roughly 1.2 kilometres from her nest close to where she had been learning to hunt under her parents’ watchful eyes. At first, the team suspected natural predation.

However, during recovery, one small detail caught their attention — a small, round dent and hole in the satellite tag. It was an anomaly that couldn’t be ignored.

Damage to tag © Natural England

Bird remains © Natural England

This discovery triggered the involvement of the UK National Wildlife Crime Unit (NWCU) and the Harrier Task Force (HTF). Working closely with Natural England, the Northumbria Police Rural Crime Team, and scientific experts, they began piecing together what had really happened.

Science Meets Law Enforcement

The first step was to send the remains and the tag to the Zoological Society of London (ZSL) for a detailed postmortem. Due to the bird’s advanced decomposition, the pathologists couldn’t confirm a cause of death, but their findings were enough to justify further forensic testing.

Radiograph of the carcase remains and the tag © ZSL

From there, the investigation moved to Nottingham Trent University (NTU), where specialists used CT scanning and chemical analysis to examine the damaged tag. Their results revealed elevated levels of lead around the hole a crucial clue pointing toward a lead-based projectile.

Finally, the tag was analysed by a ballistics expert from the Scottish Police Authority (SPA). The verdict: the damage was consistent with being struck by a shotgun pellet, likely from a birdshot cartridge fired from below the flying bird. Tests confirmed traces of lead, and the impact trajectory supported the theory of a shotgun discharge at an estimated distance of up to 30 metres.

© SPA

The conclusion was clear. This was no accident of nature. It was a deliberate act of wildlife crime.

Learning and Adapting: A Smarter Response

Thanks to the combined expertise of scientists, conservationists, and law enforcement, the incident has been officially recorded as criminal damage. Each satellite tag costs around £2,800, not including the significant resources dedicated to fitting and monitoring them but the real loss is far greater, representing another blow to hen harrier conservation efforts.

The investigation also led to important lessons for future responses. New procedures now ensure that if anything suspicious is discovered during a bird recovery — no matter how small — the process halts immediately, and police take over to conduct a forensic recovery. This prevents potential evidence from being lost and strengthens the chance of bringing perpetrators to justice.

Protecting Our Wildlife. Together

This case demonstrates the high level of skill, coordination, and dedication required to detect and investigate wildlife crime. From the precision of CT imaging and chemical testing to the meticulous work of forensic ballistics experts and the vigilance of conservation field teams every partner plays a crucial role.

It also serves as a reminder that wildlife crime is not victimless. Each illegal act damages not only individual animals but also the broader ecosystem and the tireless efforts of those working to protect it.

The public can play their part too. If you have any information about this incident or any suspected wildlife crime please report it.

Every report helps protect the wild places and species that make our countryside unique and ensures that those who threaten them are held accountable.

If you witness a suspected wildlife crime in action – call 999 immediately and ask for the police.

For all other enquires call your local Police on 101. Alternatively, contact your local Police Force directly.

If you wish to anonymously report a wildlife crime online please contact Crimestoppers