I noticed a line of ants climbing up and down a birch tree. On closer inspection they were 'farming' aphids way up in the tree. The ants protect the aphids from predators. In return they get a honey like substance from the aphids. The ants tickle the aphids with their antennae to encourage the aphid to exude their 'honey'.

These small slender hoverflies are very common in gardens. Their larvae eat aphids (ants allowing)!

Related to the dung flies that are often seen on cow pats. There are lots of these yellow / orange flies around most gardens. Magnified like this they are  impressive looking beasts.

Helophilus is one of the smartest hoverflies. Seen on flowers in gardens everywhere. Helophilus is an excellent wasp mimic. Presumably this affords the fly some protection from predators who might mistake it for a genuine wasp.

A hoverfly meets its very unpleasant death. These large, colourful spiders are common in late summer and autumn. Araneus spins its large orb webs all around the garden.