A Burundian refugee child stands outside a makeshift shelter in the Nyarugusu refugee camp in Tanzania on March 26, 2016. According to UNHCR, Nyarugusu is &quot;one of the largest and most overcrowded refugee camps in the world,&quot; currently hosting over 140,000 refugees but built to accommodate only 50,000. The camp has a resident population of around 60,000 Congolese refugees, with an influx of around 78,000 Burundian refugees since last year. (Photo: Phil Moore / Oxfam)