This is a very common berry in Brazil that is called “amora” here. It’s called “mulberry” in English, I believe. It looks a lot like a blackberry (and tastes similar too), but it’s not. Blackberry grows on a bush, but amora grows on a tree. I've seen an amora/mulberry in the US, but it doesn’t seem to be common. Here in Brazil it’s all over the place. We also had them in Kazakhstan when I was a kid. Oh, and mulberry is what they feed to silkworms. In fact, I believe I heard that they introduced it in Brazil to grow silkworms, but that didn’t quite work out, since collecting silk from the worms is a complicated business. So, now the mulberries are sold for eating. Unfortunately, the ones I bought weren’t quite ripe. They get really really fragile when they are ripe, which is probably why they are collected before they are quite ready.