This picture—taken by airplane photographer Luigi Sani—shows a weird smooth hump on the central fuselage of an Eurofighter Typhoon. It's one of its two new top Conformal Fuel Tanks, designed to further extend its range. They are now being tested by BAE Systems in wind tunnels.
The Typhoon can already carry traditional CFTs under its wings.
A Typhoon model with the top CFTs in a wind tunnel.
An Israeli F-16 with similar tanks.