A yellow fly, looking
      like a bee, on a yellow dandelion.

Syrphida fly

A yellow Syrphida on a yellow dandelion collects pollen like a bee or bumblebee. The fly looks like a bee but it is not dangerous, it only scares birds. House centipede is mentioned here because it is also not dangerous but creepy.

The syrphida looks like a bee
Yellow Syrphida

different species of hoverflies from wikipedia
Wiki

Centipede watches you
House centipede