The wealth of the poorest and richest have been grouped into ten equal groups (decile) and over the past 15 years it shows that the wealth of the richest has grown disproportionately in comparison to that of the poorest which remains relatively unchanged
I find the first one OK, as it gives a decent visual interpretation of the point and aids understanding. However, the graph showing 70 times as many chickens as people is hardly necessary. As a regular Guardian reader I see a lot of these. Clearly some are meant more as a way of giving a bit of a visual lift to an otherwise anodyne article, whereas some are genuinely useful. I’m not sure what other papers do and it may be interesting to see if they are any better.