You find them wherever you find plants. Insects of course but also spiders, millipedes and centipedes; toadstools and other fungi, and all other beings that belong to nature.
Here are a few as a starter.
This one is called Dyer's polypore or Norway Chicken (don't know why; the Norwegian name is "gulrandkjuke" = yellow rim polypore), (Phaeolus schweinitzii). It causes rot on conifers but this one popped up on a dead rose shrub near a pine stump. The fruiting body developed in a month and then disintegrated into a very colourful slime.
The next two are caterpillars, Grass eggar (Lasiocampa trifolii) and Lettuce shark (Cucullia lactucae). The first one feeds on various trees and shrubs. I found it defoliating a Helianthemum. The second feeds on several Asteraceae and I found it on a sow thistle (Sonchus). I didn't kill any of them, softhearted as I am ;)
This is a common butterfly Scarce copper (Lycaena virgaureae) - or to be more specific, is a representant for a common genus with several species. Always a joy to see.
The last one is a South American bee. Several bees were busy with this Pericum relative along the river Churun where we made a stop for lunch on our way up the river to take a look at Angel Falls.