Crash course: shrike surveying
Publié leaoût 6, 2026parChristopher Barkwell|La pie-grièche migratrice de l'Est, Rétablissement de la pie-grièche migratrice de l'Est, Actualités et événementsPhoto: C. Barkwell
Qu'est-ce que le Programme de rétablissement de la pie-grièche migratrice de l'Est? Après une chute précipitée de la population sauvage de pie-grièche migratrice de l'Est dans les années 1990, Environnement Canada a invité Conservation de la faune au Canada à se joindre à l'effort de rétablissement multi-partenaires en 2001. Depuis, la taille de la population sauvage a fluctué. Des études ont montré que bien que l'effort de rétablissement ait empêché l'espèce de disparaître du Canada, plus de travail est nécessaire pour identifier et aborder les causes du déclin de l'espèce. CFC travaille pour empêcher la pie-grièche migratrice de l'Est de disparaître en renforçant la population sauvage en Ontario, et en étudiant l'espèce pour en apprendre davantage sur les menaces qu'elle fait face.
University of Guelph Master of Wildlife Biology Student Chris Barkwell spent the summer with Wildlife Preservation Canada’s Eastern Loggerhead Shrike Recovery Team, as part of the program’s hands-on training and skill development. WPC provides opportunities for Canadian biologists to increase their expertise, helping to build to this country’s conservation capacity, and is excited to provide a space for these students.
Part of the Eastern Loggerhead Shrike Recovery Program involves surveying and monitoring wild shrikes throughout the breeding season. Here’s what a typical day looks like and why it matters!
Field Safety Tips
Before any shrike surveying begins, staying safe in the field is key. A typical survey day is long and outdoors, so come prepared:
- Wear long pants, sturdy shoes, and sun protection.
- Bring water, snacks, warm layers, and rain gear.
- Protect against bugs.
- Stay alert around roads.
- Respect private property.
- Tell someone where you’re going and set up a check‑in plan.
- Be aware of wildlife you may encounter
A bear running away after it saw me in the field. Learn how to be bear smart before heading into the field. Photo by C. Barkwell.
What is surveying?
Surveying starts in early May, when shrikes return to Canada for the summer. “Surveying” basically means heading out into shrike habitat and looking for these birds. WPC surveys two main areas: Carden Alvar et Napanee, the last two places in Canada where eastern loggerhead shrikes reliably come back to breed. WPC has mapped out patches of suitable habitat in both regions, mostly conservation lands and cattle pastures.
Shrikes are picky about where they live. They need:
- Open grasslands for hunting (they spot prey from above and swoop down to catch it).
- Scattered bushes and trees for nesting and perching while they scan for prey.
Other helpful features include short grass (so prey can’t hide easily) and distance from human disturbance like busy roads because shrikes can be skittish towards human presence.
Additionally during surveys habitat is assessed to determine if it is still suitable because habitat changes over time. For example, if shrubs start taking over an open field, shrikes may no longer use it.
Conservation land in the Carden Alvar. This is a great example of habitat shrikes would like. Photo by C. Barkwell.
How do you find a shrike?
Finding a shrike is part skill, part patience, and part luck.
- Watch their favourite perches.
Shrikes love sitting on the tops of trees and bushes, especially dead trees with a good view! If you see a bird swoop to the ground and then pop back up to a perch, that’s classic shrike hunting behaviour. - Listen carefully.
Shrikes don’t sing often, but you might hear an alarm call if you get too close, or the begging calls of fledglings waiting for food. These sounds can help us zero in on shrikes. - Use call-playbacks (only if you’re trained)
Call‑playbacks are recordings of shrike calls used by trained conservation staff to attract shrikes toward an area. They’re helpful, but they must be used responsibly, never by casual birders. Playbacks can accidentally draw birds toward predators or roads, and frequent use can stress them out.
Confirming we’ve found a shrike!
Once we spot a bird that might be a shrike, grab your binoculars or scope; shrikes don’t usually let us get close. Remember they don’t like human presence!
Look for:
- A mostly grey body with black and white markings.
- A bold black mask across their eyes.
- A large head, the name “loggerhead” literally means “big head”!
For a deeper dive check out WPC’s blog post on Comment identifier une pie-grièche migratrice. And if you do find a shrike, keep your distance, stay out of sight (behind a bush), and remain quiet. Shrikes are sensitive, and we want them to feel safe!
A loggerhead shrike perched far away. You won’t always get a good view of the shrike so it’s important to know those distinguishing features. Photo by C. Barkwell.
What is monitoring?
Once a shrike pair or individual is found, monitoring begins. Surveillance means regularly checking on known shrike locations and recording what the birds are doing. This is very important for breeding pairs because their behaviour tells us how their nesting is progressing.
During monitoring, staff look for things like:
- How often parents visit the nest.
- What kinds of calls are heard.
- How often adults hunt.
- Whether fledglings are visible.
- Any predators in the area.
These clues help determine whether a pair is establishing a territory, building a nest, incubating eggs, feeding nestlings, or caring for fledglings.
Two American kestrels perched. Kestrels will prey upon shrike nests and can eat their eggs, nestlings, or fledglings. Photo by C. Barkwell.
Banding shrikes
Sometimes shrikes are banded during monitoring. A bird band is a small ring placed on a bird’s leg. Shrike bands include:
- One Silver band with a unique identifying number.
- One to three colour bands so individuals can be identified from far away.
If a banded shrike is seen again, it can tell us where it migrated for winter and whether it returned to the same breeding area the next year. During the banding process we also take a blood sample and feather sample. These samples give us insight into a bird’s genetics and can even tell us where birds migrate! Banding is done by trained professionals to reduce stress on the birds and prevent injury.
Banding of a wild loggerhead shrike, gauze is applied after a non-invasive prick is given to the shrikes foot to draw blood for a sample. After a few moments with slight pressure with the gauze, the bleeding stops and they’re ready to be released. Photo by C. Barkwell.
Nest checks
Nest checks involve using a small camera on a pole to take a photo of the nest. This helps determine how many nestlings there are and how old they might be. Nest checks should only be done by trained professionals, doing them incorrectly can cause parents to abandon the nest.
Why do we do all this?
Monitoring wildlife helps us understand population health: how many individuals there are, whether the population is growing or shrinking, and what threats they face (like habitat loss or new diseases). It also helps us understand normal behaviour for a species.
For the Eastern Loggerhead Shrike Recovery Program, monitoring guides other parts of the project, including the release of captive‑bred shrikes and land stewardship efforts. In short, monitoring tells us what shrikes need and how we can best support them!
Christopher Barkwell
Shrike Recovery Field Intern – Eastern Loggerhead Shrike Recovery
Christopher is excited to join WPC as a Shrike Recovery Field Intern for his Master of Wildlife Biology practicum at the University of Guelph. With a passion for conservation and wildlife he has gained experience with aquatic invertebrates, species at risk songbirds, and small mammals. Originally from Manitoba, Chris is eager to explore Ontario’s natural landscape, learn more about the species here, and gain experience with the recovery of the loggerhead shrike.
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