An animation explaining the death of bees

A YouTube channel called In a nutshell (formerly known as Kurzgesagt) have made an animation explaining what is causing the decline in honey bees. They have made lots of great videos so it's well worth taking a look at their other videos, including an extremely good animation about the current Syrian refugee crisis.

In this video they start by making clear how much bees are needed for human life to succeed. They go on to explain how humans are the cause of some serious problems for bees, and how some parasites are adding significantly to their plight.