Trees

Identifying Wildlife Damage to Trees, Shrubs, & Bushes

Where is the damage occurring?

On the trunk?

On the Branches?

Buck rub. Photo by David Mooter Deer browse to bushes. Photo by John Kaczynski

On the trunk:

Bears:

Bears can scrape bark in search of sap and insects. Some markings may also have a territorial significance.

Photo Needed. To share yours contact scott.hygnstrom@uwsp.edu

Beavers:

They can strip the bark to a standing height of less than 6 feet. Look closely for large scrape marks created by their teeth. These marks will help distinguish the damage from voles. Also voles tend to debark thinner trees. Beavers can also cut down trees.

beaver gnawing

beaver scraping

Deer:

Bucks will rub small shrubs (approximately 4 ft high) and bushes damaging branches and trunk.

deer rub

Feral Hogs:

Feral hogs can rub against trees to scrape the mud off. Typically this damage will be less than 4 feet high.

Photo needed. To share yours contact scott.hygnstrom@uwsp.edu

Porcupines:

Porcupine damage will typically be high up in the tree and will focus on the trunk bark and branches. Damage typically occurs during the night.

bark damage porcupine

Rabbits:

Rabbits will girdle the trunk of trees (usually smooth barked) as high as they can reach. Don’t forget that snow cover can raise their elevation and therefore extend the height of their gnawing during winter.

tree girdling

Tree Squirrels:

Squirrels can also strip bark on the trunk or the branches. Damage typically occurs in late winter or early spring.

For more details about squirrel bark stripping click here.

fox squirrel bark damage

Voles:

Voles will girdle trees, particularly during harsh winters when food is scarce.

tree girdle

Woodpeckers:

This flicker nest is a good example of the damage that can occur to trees by woodpeckers.

flicker damage

On the branches:

Deer:

Bucks will rub small shrubs (approximately 4 ft high) and bushes damaging branches and trunk. Deer will browse on tree branches and shrubs to a height of around 6 feet. Deer browse can be distinguished from rabbit damage by both the height of the cutting and the lack of a clean 45 degree cut.

deerrub

cutlimb

Porcupines:

Porcupine damage will typically be high up in the tree and will focus on the trunk bark and branches.

 barkdamage

Tree Squirrels:

Squirrels can clip the ends of tree branches and cause an extensive amount of damage as shown by the large quantity of evergreen clippings that have fallen to the ground. Squirrels can also strip bark on the trunk or the branches. Damage will typically occur in late winter or early spring. A critical sign will be the presence of small (1/2-inch) remnants of bark found below the branches that have been stripped. These remnants comprise a key difference between branches damaged by porcupines and those damaged by tree squirrels.

For more information on bark stripping, click here.

Bark stripping by Fox squirrel

 

treeclipping

Additional Resources

Vertebrate Pests of Southern Hard and Softwood Trees – Florida Division of Forestry