Smaller than Great Tits, Blue Tits are also birds of woodland, parks and gardens where they nest in holes in trees, but are just as happy to use nestboxes as substitutes. Tits are active feeders, hunting out insects and spiders amongst the smaller branches of trees in woodlands. But they are also well-adapted to gardens and towns and will visit birdtables and peanut feeders, and are even famed for breaking the tops of milk bottles and taking the creamy top off the milk. In winter, they will form flocks with other tits, roaming the countryside and visiting gardens in groups. Blue Tits have a trilling song: ‘tsee-tsee-tsee’.