Disappearing act
On warm spring days, you may see small bees or wasps flying low over the ground. They land, disappear into a hole and then pop back out. Most likely, they are building nests.

As soon as spring temperatures rise above 15 °C, many animals become active enough to breed and build nests.
To fly, insects need it to be warm enough. As soon as this happens, many species can become active and start building nests.
On warm spring days, you may see small bees or wasps flying low over the ground. They land, disappear into a hole and then pop back out. Most likely, they are building nests.

Many insect species dig nests in the soil. An open strip of sand along a path may contain several nests. Just look for the small piles of sand.

Some birds use roof edges or ledges for their nests. City buildings offer many structures that work well for this. Even a small corner may be big enough.

Blackbirds and other songbirds often build their nests in dense shrubs. On warm days, you can see them flying in and out with nesting material such as twigs and grass.
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