Mammals Found in Hamilton Ontario

Exploring the Mammals of Hamilton

Hamilton’s landscape is more than forests, wetlands, and escarpments. It is home to a wide range of mammals, many of which live quietly alongside us, often unseen.

The Mammals of Hamilton guide offers a detailed look into this hidden world, documenting species that inhabit the region and revealing how they interact with the environment.

Because mammals tend to be elusive and often active at night, understanding their presence requires years of observation, data collection, and collaboration. This guide brings that work together into a single, accessible resource.

Flip through the PDF below to explore mammals found throughout Hamilton:

You can also download the full guide for your own reference:

Mammals In Hamilton, Ontario.

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A Landscape Rich in Biodiversity

Hamilton’s diversity of mammals is no accident.

The city sits at the meeting point of two major forest regions:

• The Carolinian Forest Region

• The Great Lakes–St. Lawrence Forest Region

Add in features like the Niagara Escarpment, wetlands, and lakeshore environments, and you get a landscape that supports a wide variety of species with very different habitat needs.

Because mammals often require specific conditions to survive, their presence can tell us a lot about the overall health of an ecosystem.

A Complex and Evolving Record

The guide is based on one of the most comprehensive mammal inventories for Hamilton, combining:

• Historical records

• Field surveys

• Confirmed sightings

• Data from organizations, researchers, and naturalists

This long-term approach matters. Mammal populations change over time, and tracking those changes helps identify which species are thriving, declining, or disappearing.

Currently, the inventory includes:

• 44 extant (currently living) species

• 12 extirpated species no longer found in the region

Some species remain difficult to assess, particularly bats, which are now classified as uncertain due to limited recent data and environmental pressures such as White-Nose Syndrome.

Understanding Species Status

Each species in the guide is assigned a local status based on how frequently it appears across the region:

• Common – Found in many locations

• Uncommon – Limited to a small number of sites

• Rare – Found in very few locations

• Extirpated – No longer present in Hamilton

• Uncertain – Not enough recent data to confirm status

This classification helps identify which species may need greater protection and which are adapting well to changing environments.

Species You May Recognize (and Some You Won’t)

Hamilton is home to a wide range of mammals, from highly visible species to those rarely seen.

Common species include:

• Eastern Gray Squirrel, an important contributor to forest regeneration through seed dispersal

• Raccoon, highly adaptable and commonly found in both urban and natural environments

• Coyote, a skilled predator that has successfully adapted to life alongside humans

• Beaver, a true ecosystem engineer that reshapes wetlands and waterways

Other species are less commonly encountered:

• Northern Flying Squirrel, rarely seen due to its nocturnal habits

• American Badger, a rare and provincially significant species

• River Otter, present but limited to specific habitats

The guide also notes introduced species such as the Norway Rat and House Mouse, which are not native to the region but now form part of its ecological landscape.

What We’ve Lost

One of the more sobering aspects of this guide is the list of species that no longer live in Hamilton.

These include:

• Gray Wolf

• Black Bear

• Canada Lynx

• Bobcat

• Wolverine

• Elk

There are also species considered hypothetically extirpated, meaning they likely once lived here but lack confirmed records.

It’s a quiet reminder that ecosystems change, and not always for the better.

Why This Guide Matters

Mammals are often seen as the most familiar part of the natural world, but they are also some of the most sensitive to environmental change.

By documenting where species exist, how common they are, and how their populations have shifted over time, this guide provides a foundation for conservation and awareness.

It also invites people to notice what is often overlooked. A movement in the trees, tracks in the snow, or a quiet presence at dusk may be part of a much larger story unfolding across Hamilton’s ecosystems.

Looking Ahead

The Mammals of Hamilton volume is part of the growing Our Fragile Environment series, which continues to document the biodiversity of the region through research, collaboration, and art.

Together, these resources build a clearer picture of the natural world around us, one that reminds us that even in a busy city, wildlife is never far away.

You just have to be paying attention.