It is safe to put out bird food all year round, however consumption will fall significantly during the summer months. There are two main reasons for this. The first is that most birds change their diet during the summer months, consuming a higher proportion of insects during this time. Secondly, birds or more widely dispersed during the summer months establishing breeding territories. For example, both Great Tits and Robins feed their young almost exclusively on live food such as caterpillars and insect grubs.