Blue tits (Cyanistes caeruleus) are small passerine birds that are found in Europe, Asia, and North Africa. They are a popular bird to watch in gardens and parks, and are often seen coming to bird feeders. However, some blue tits may also try to come inside houses. There are a few reasons why this might happen.
One reason why a blue tit might want to come inside is to find food. Blue tits are insectivores, and they will eat a variety of insects, including flies, mosquitoes, and caterpillars. In the winter, when insects are less common, blue tits may come to bird feeders to find food. If a bird feeder is placed near a window, a blue tit may see it and try to come inside to get to the food.