When birds change their migration routes, it can have both positive and negative effects. On the positive side, changing migration routes can help birds avoid threats such as habitat destruction, climate change, or predators. However, changing routes can also lead to increased competition for resources in new areas, potential conflicts with other bird species, and disruption of ecosystems that rely on the birds' presence for things like seed dispersal. Overall, the effects of birds changing their migration routes can vary depending on the specific circumstances and the ability of the birds to adapt to their new environment. **

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. **

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. **

No, birds are not typically nocturnal. Most birds are diurnal, meaning they are active during the day and rest at night. However, there are some exceptions, such as owls, nighthawks, and nightjars, which are known to be nocturnal or crepuscular (active at dawn and dusk). These birds have adapted to hunt or forage for food during the night when their prey is most active. **

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. **

No, birds cannot cry in the same way that humans do. Birds do not have tear ducts like humans, so they are not able to produce tears to express emotion. However, birds can still exhibit signs of distress or sadness through their vocalizations and body language. So while they may not cry in the same way as humans, they can still communicate their emotions in other ways. **

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. **