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Things That Are Toxic To Geese

It can be a challenge to ensure geese residents have healthy, happy lives after coming to a sanctuary, and there are many different aspects of care to consider each day. Unfortunately, toxic and poisonous hazards are sometimes overlooked in the hustle and bustle of operating a sanctuary. While minor exposure to many of these toxins are unlikely to cause serious problems, large amounts can cause severe health issues and sadly, even death. Many geese may instinctively avoid toxic plants or avoid them because many are bitter to the taste. However, there are also some toxins that are highly dangerous even in small amounts and others that are quite palatable. In order to help ensure you never run into this problem, we have compiled this resource of common plants and other potentially toxic things that have been known to be a problem for geese.

Plants That Are Toxic To Geese

Please see The Open Sanctuary Project’s Global Toxic Plant Database and filter Species Afflicted by Geese in order to see a list of plants across the world that are toxic to geese. Please note that, while comprehensive, this list may not contain every single plant toxic to geese!

Other Potential Geese Toxins

Blue-Green Algae

Blue-green algae is often found in stagnant water when temperatures are high. This algae can be toxic to geese if they ingest contaminated water. The type of toxin ingested will determine the symptoms. geese need only ingest but 1.2 oz (40 ml) of algae bloom to be fatal. In most cases of poisoning, geese are usually found dead, due to the potency of the toxin.

Symptoms include:

  • Hypersalivation
  • Regurgitation
  • Diarrhea
  • Tremors
  • Reduced Responsiveness
  • Lethargy
  • Ataxia
  • Dilation of cutaneous vessels in webbed feet
  • Recumbency
  • Wing and leg peresis
  • Cyanosis
  • Excessive thirst
  • Open mouth breathing
  • Intermittent seizures
  • Sudden death 


Botulism can be contracted if geese eat or playing in contaminated soil, water, or decaying matter, spoiled feed, or by consuming maggots who harbor  the toxins. Signs of botulism in geese includes:

  • Paralysis
  • Weakness
  • Muscle Tremors
  • Stumbling
  • Recumbency
  • Limp neck
  • Droopy Eyelids
  • Death

In order to prevent botulism, be sure to Inspect water sources for dying or dead animals and promptly dispose of any bodies properly then dump contaminated water and thoroughly clean the water container and refill with fresh water. Prevent residents from accessing stagnant bodies of water!

Chick Starter (Medicated)

Goslings should be given a waterfowl starter, if at all possible. Many chick starter foods contain medication to treat coccidia; this medication can be fatal to goslings. It can also cause niacin deficiency, leading to a host of joint and leg problems for the gosling.


Sometimes, copper sulfate is used to treat crop mycosis or digestive issues in geese. However, copper sulfate in a single dose of >1 g is fatal and should be used with care. Symptoms of copper toxicosis are listlessness and watery diarrhea. At a necropsy, burns and erosions are found in the lining of the gizzard, along with a green mucous throughout the intestinal tract.

Hardware Disease

Hardware Disease refers to the injuries that can result from any animal resident eating something they shouldn’t, especially pieces of human-made hardware like nails, screws, and staples. Hardware disease can have devastating effects on any resident. Check out our resource on Hardware Disease prevention here. Geese are prone to zinc toxicity which is often the result of eating small, shiny metal objects containing zinc. When ingested, a zinc object, such as a penny, is broken down in the gastrointestinal track and zinc is released into the body. This can cause damage to red blood cells, the pancreas, and the gizzard. US pennies made after 1983 contain 98% zinc and a single one can be fatal to a geese, if swallowed. Hardware that may also contain zinc includes, nails, bolts, plumbing nuts, nuts, washers, screws, staples, etc, as well as galvanized metal

Symptoms of zinc poisoning include:

  • Depression
  • Weakness
  • Increased thirst
  • Seizures
  • Green to yellow droppings
  • Stiffness
  • Cyanosis
  • Incoordination
  • Posterior paresis/paralysis
  • Loss of appetite
  • Weight
  • Vomiting
  • Lethargy 

Lead Toxicity

Lead was once used in paints and pesticides, and can also be found from natural environmental sources. Even if you have never used any products containing lead, it may still be present in old barn or fence paint, or in the soil. Places where old machinery and leaded gas have been stored may also have caused contamination, as would old treated lumber and railroad ties. Geese may ingest the lead in the environment through the consumption of paint flakes, plant material that has absorbed lead in the environment, and from tainted surfaces.

Signs of lead poisoning in geese are:

  • emaciation
  • depression
  • inappetence
  • thirst
  • weakness
  • greenish droppings commonly seen within 36 hours
  • As poisoning progresses, the wings may be extended downward. 
  • Young birds may die within 36 hours of ingestion. 

Having the soil tested at your sanctuary is an easy way to learn if the environment is safe for residents. You can check with a local environmental conservation service, or agricultural extension office to inquire about testing. It is usually a fairly quick and easy process. Prevent your residents from accessing buildings and fences with old paint.

Consult a veterinarian immediately if you suspect a goose has ingested lead or is beginning to show symptoms of lead poisoning.


Mycotoxins are a toxin produced by molds (fungi) that are harmful to many animals, including geese. Mycotoxins, specifically aflatoxins can affect geese through contaminated food or bedding. Moist, warm environments make a perfect recipe for mold reproduction. Aspergillus and Penicillium can produce aflatoxins and can be a particular concern for birds.

Symptoms include:

  • inappetence
  • ataxia
  • convulsions
  • opisthotonos
  • depression
  • death

Prevention is key in avoiding serious health issues. Luckily, there are a number of steps you can take to help ensure resident geese do not suffer the ill effects of mycotoxin poisoning:

  • Be sure to keep food, grain, and hay storage areas clean, dry, and cool
  • Try to keep food storage areas protected from mice and rats and other wildlife, as they can chew holes in food bags, increasing the likelihood of grain being exposed to damp conditions
  • Always feed the oldest sources of food first. Try to use up open food bags within a few weeks after opening in the winter and in even less time in the summer
  • Clean any storage bins or cans thoroughly to remove old grain that may get stuck in cracks and crevices
  • Check with your food manufacturer or supplier to see if they regularly test for the presence of mycotoxins in grains before mixing food. If they do not, avoid using them and find another supplier

If you are concerned about the possibility of mycotoxin contamination, have your food stores tested. This could be especially important if you have a geese that shows initial signs of mycotoxin exposure.

Pesticides, Herbicides, And Rodenticides

It may not come as a surprise that herbicides and rodenticides can cause toxicosis in geese if ingested. If geese ingest plants or insects that have been sprayed with phenoxy acid herbicides, they can become ill or even die. For this reason, it is imperative that geese are not given treated plants or are allowed access to pastures that have been treated with herbicides.

While rats and mice can pose challenges for sanctuaries, it is important to respect them and use compassionate mitigation practices. In addition to the compassion and consideration mice and rats deserve, many rodenticides are anticoagulants act by preventing the blood to clot and geese may find and attempt to eat the poisoned body of a mouse or rat and become poisoned themselves if poison is used. There are many new and innovative ways to address rodent populations that are more effective and compassionate.

Early treatment is critical. If you suspect a goose may have ingested any of the poisons above, contact your veterinarian immediately. Blood tests may confirm poisoning.


Venomous snakebites are not common, but when they occur, should be treated seriously and immediately. If you notice a snakebite, look for others. Snake venom varies by species, and the severity of a bite can also be influenced by size, age, and the number of bites. Most venoms can impair blood clotting and damage the heart, while some others contain neurotoxins. Signs of a snakebite may include:

  • Pain
  • Swelling at the bite site
  • One or more puncture wounds
  • Sloughing of tissues near the bite site
  • Cardiac arrhythmias
  • Impaired ability for their blood to clot
  • Shock
  • Collapse
  • Paralysis
  • Death

Seek veterinary care immediately if a goose is bitten by a venomous snake. Do NOT try to suck the venom out or place a tourniquet. Keep the goose calm while seeking immediate veterinary care. Depending on the severity of the bit, treatments may include antivenin, pain medications, fluid therapy, wound treatment, tetanus vaccination, and antibiotics. Check out our Compassionate Wildlife Practices At Your Animal Sanctuary for some tips on how to dissuade snakes from your property.

Wood Stains And Paints

Some wood stains and paints can be toxic to residents. Residents may try to peck at painted surfaces and can become ill if the stain or paint is toxic. Try and purchase paints and stains that are specially made for barns and fencing and listed as animal or “livestock” friendly.

Foods That Are Toxic To Geese

There are a number of plants and human food that should absolutely not be fed to geese, due to toxins and substances that geese cannot digest or tolerate.

Do not feed geese the following:

  • Avocado, any part- contains the toxin persin
  • White potato, any part- contains the toxin solanine
  • Green tomato, as well as tomato leaves- contains the toxin solanine
  • Eggplant and pepper leaves- contains the toxin solanine
  • Green potatoes- contains the toxin solanine
  • Apple, apricot, cherry, peach, pear, plum SEEDS/PITS (fine if cored)- contains cyanide
  • Rhubarb, any part- contains oxalic acid which can lead to soft-shelled eggs. Toxic leaf.
  • Dried beans, raw, and bean plants (fine if sprouted)- contains phytohemagglutinin
  • Raw peanuts, hazelnuts, walnuts, and pecans- may inhibit protein absorption
  • Dry rice- can cause gut problems
  • Onions, any part- contains the toxin thiosulphate
  • Chocolate- contains the toxin theobromine
  • Coffee or tea- contains caffeine which is dangerous to geese
  • Anything visibly moldy or rotten
  • Alcohol
  • Processed human foods, especially greasy, salty, or sweet foods
  • Anything sprayed with pesticides or herbicides

Additionally, you should limit feeding geese the following things:

  • Spinach- the oxalic acid interferes with calcium absorption
  • Citrus- can interfere with calcium absorption
  • Iceberg lettuce- can cause diarrhea in large amounts, has little nutritional value

Most of the time geese will avoid things that aren’t good for them, but if food is scarce, or it is included in with other things they normally eat, they can’t always be trusted to steer clear. 


While this list isn’t exhaustive, it can certainly help you keep resident geese safe, healthy, and happy!


Is There Lead In Your Pasture? | Of Horse

Animal Friendly Barn And Fence Paint For Horse Stalls | Stuff For Petz

Guide To Poisonous Plants | Colorado State University 

Poisonings in Poultry | Merck Veterinary Manual 

Gooseberry Bushes: Deadly for Geese and Other Pets | Pet Helpful

Toxic Plants A-Z | PoultryDMV (Non-Compassionate Source)

Plants That Are Poisonous to Chickens | Gardening With Free-Range Chickens For Dummies (Non-Compassionate Source)

Blue Green Algae Poisoning | Poultry DMV (Non-Compassionate Source)

Protect You Horses And Livestock From Toxic Plants | Washington State Department Of Agriculture (Non-Compassionate Source)

If a source includes the (Non-Compassionate Source) tag, it means that we do not endorse that particular source’s views about animals, even if some of their insights are valuable from a care perspective. See a more detailed explanation here.


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Updated on October 7, 2019

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