A migrant child gives a thumbs-up as he arrives to a newly erected refugee camp in the Croatian town of Opatovac, 20 kms from Tovarnik, on September 20, 2015. The camp has 200 tents, each with a capacity of housing 24 people. Migrants are still mostly gathered on Croatia's main border crossings with Slovenia, seeking transit through Slovenian territory in their bid to travel to northern Europe.  AFP PHOTO / STRINGERSTRINGER/AFP/Getty Images