Lower classifications of fir trees include the subgenus Abies, which consists of about 50 species of true firs. These firs are further divided into different sections based on their characteristics, such as the balsam firs (section Balsamea) and the silver firs (section Amabilis). Each section contains several species of fir trees that share similar traits and habitats. Overall, the lower classifications of fir trees help to organize and categorize the diverse species within the genus Abies. **

Horses should not eat fir trees as they are toxic to them. Fir trees contain toxins that can be harmful to horses if ingested, potentially causing digestive issues, colic, and other health problems. It is important to ensure that horses do not have access to fir trees or any other toxic plants in their environment to keep them safe and healthy. **

Cattle should not eat fir trees as they are toxic to them. Fir trees contain a substance called abietic acid, which can cause digestive issues, weakness, and even death in cattle if consumed in large quantities. It's important to ensure that cattle have access to safe and appropriate forage to prevent any potential harm to their health. **

To kill fir trees, you can cut them down using a chainsaw or axe. Make sure to cut the tree as close to the ground as possible to prevent regrowth. You can also apply herbicides to the stump to prevent new growth. It's important to follow local regulations and guidelines when killing fir trees to ensure you are doing so in a safe and environmentally responsible manner. **

Yes, fir trees are considered to be mildly toxic to cats. The oils and resins in fir trees can cause irritation to a cat's mouth and stomach if ingested. Additionally, the needles of fir trees can cause irritation to a cat's mouth and digestive tract if swallowed. It's important to keep fir trees and their needles out of reach of cats to prevent any potential harm. **

No, guinea pigs should not eat Nordmann fir trees. These trees are not safe for guinea pigs to consume and can be harmful to their health. The needles and sap of the Nordmann fir tree can be toxic to guinea pigs and may cause digestive issues or other health problems. It's important to provide guinea pigs with a diet that is safe and appropriate for their digestive systems, such as hay, fresh vegetables, and a small amount of fruit. **

Ivy can potentially harm fir trees if it grows unchecked and covers the tree's canopy, blocking sunlight and inhibiting the tree's ability to photosynthesize. This can weaken the fir tree and make it more susceptible to diseases and pests. However, ivy itself is not a direct killer of fir trees, but rather a contributing factor to their decline if left unmanaged. Regular monitoring and control of ivy growth around fir trees can help prevent any negative impacts on their health. **

When housing horses under fir trees, it's important to consider the potential hazards associated with the trees, such as falling branches and needles. To minimize these risks, it's best to keep the horses away from the immediate vicinity of the trees and regularly inspect the area for any signs of damage or potential hazards. Additionally, providing ample shelter and turnout areas away from the trees can help ensure the safety and well-being of the horses. Regularly cleaning up any fallen branches or needles can also help maintain a safe environment for the horses. **