Eggs: why are some white and some brown?

I was having breakfast this morning and I asked my mother: 'Where are these eggs from?'. She told me they were from fruit and vegetable shop on the corner. But this egg is white! (our eggs are normally brown). And so I asked 'Why are some eggs white and some eggs brown?', 'What makes them the colour they are?' Do they taste different? (We don't think they do but maybe a beefeater could tell the difference).

And here's what we found out! It's the colour of the hens! White hens have white-ish eggs and brown-reddish hens have brown-ish eggs!

We also did a bit of research to see if there was any difference inside the eggs (some people think brown eggs are healthier than white eggs) but found out this was a myth (or an idea that people think is true but actually isn't).

I'm off to school now but if you have any interesting eggy information, please do leave a comment!