Study this screen grab from the BBC Science/Nature home page carefully:

According to the huge boost story, it would seem the gorillas are doing well in the northern Congo, but the plummeting story is from four years ago. The extinction story is about the whole spectrum of primates.

I suspect when your archival material is jarringly different from your current news, you might want to find some way to differentiate it as archival. But that's just me.