Posted: 02/10/2013 at 14:15
As Fidgetbones says, nothing at all to do with the cat scarer.
Mushrooms of all varieties grow from mycellium which is below the ground surface all over the place. Depending on the type of fungi and the time of year, and a combination of climatic conditions, the mycellium will produce it's fruiting bodies i.e. mushrooms.
Nothing at all to worry about - just another glorious example of nature at its bountiful best at this time of year.
This year promises to be a very good one for fungi of all kinds.
Not possible to identify yours, so all you need to do is brush them away into the flowerbeds before you mow the lawn to avoid making a soggy mess on the lawn. They'll decompose in the borders and do no damage to anything. If you prefer you can gather them and put them on the compost heap or in the bin.
There's nothing you can or need do to prevent a recurrence another year. They'll either appear or they won't - that's nature