Invite birds to your garden and offer them a nesting place.
You can often build birdhouses in hardware stores, garden centers or even at NABU.
However, it is much cheaper with the construction manual of NABU:
Not only we humans like`s cozy warm in winter 😉
Birds, squirrels also appreciate a dry place to sleep and that’s why it’s a good idea to offer shelter to our winged friends at any time of the year.
For the offspring it needs just as much a safe place to breed.