Great Bustards near Mértola, Portugal (at the limits of resolution)

We spent much of the day today looking for Great Bustards…driving the back roads between Castro Verde and Mértola in Portugal, scanning the short grass fields. We did not find any close. This is the best we could do today. Great scope views, but just out of range for my 600mm lens. It looks to me like this is two females or one female and one immature male. Those who know better should correct me if I am wrong. Sony RX10iv at 600mm. 1/800th @ f4 @ ISO 100. Processed and cropped heavily in Photoshop Express. Day 4 of my tour of Lisbon and Southern Portugal with Birds and Nature Tours Portugal. I am the guest to the Municipality of Mértola tonight.