Birds are resistant to deadly nightshade because they lack the specific receptors in their nervous system that are affected by the toxic alkaloids present in the plant. These alkaloids can be lethal to many animals, but birds have evolved a certain level of resistance to them. Additionally, birds have a faster metabolism compared to other animals, which allows them to process and eliminate toxins more efficiently. This resistance likely developed as a survival mechanism to allow birds to feed on a variety of plants without being affected by their toxic compounds. **

Budgerigars are considered nomadic birds. They are known to move in search of food and water, and their movements are often influenced by changes in weather and resource availability. While they do not have a set migration pattern like some bird species, they are not sedentary and can cover large distances in search of suitable habitats. **

It is unclear what is meant by "birds are behind birds" without further context. It could refer to birds following other birds in a flock, birds being positioned one after the other in a line, or birds being hidden or obscured by other birds. The interpretation would depend on the specific situation or scenario being described. **

To apply a new waterproofing membrane on top of an old bitumen waterproofing membrane, the surface of the old membrane should be thoroughly cleaned and prepared. Any loose debris, dirt, or old adhesive should be removed to ensure proper adhesion of the new membrane. Once the surface is clean, a primer should be applied to promote adhesion between the old and new membranes. Finally, the new waterproofing membrane can be installed according to the manufacturer's instructions, ensuring that it is properly sealed and bonded to the old membrane to provide effective waterproofing. **

A utility knife or a sharp blade is typically used to cut the waterproofing membrane. It is important to use a sharp tool to ensure clean and precise cuts, which will help in achieving a proper seal and prevent water leakage. Care should be taken to avoid damaging the underlying surface while cutting the membrane. **

No, birds do not have the ability to spit like humans do. Birds do not have salivary glands in their mouths like mammals do, so they do not produce saliva in the same way. Instead, birds have a specialized gland called the uropygial gland near the base of their tail that produces an oily substance used for preening and waterproofing their feathers. **

Birds have complex cognitive abilities and are capable of problem-solving, learning from experience, and using tools. They can exhibit behaviors that suggest they are capable of thinking, such as planning for the future, recognizing themselves in a mirror, and even displaying empathy towards others. While their brains are structured differently from mammals, birds have shown impressive cognitive skills that indicate they are capable of some form of thinking. **

Birds do not have a separate urinary system like mammals do, so they do not pee in the same way. Instead, birds excrete waste in the form of uric acid, which is combined with their feces and expelled together. This mixture is often seen as a white, chalky substance. So, while birds do not pee in the traditional sense, they do excrete waste through a different process. **