In November 2004, Eva and Juan left to London, where they recorded their fourth album, called "Pájaros en la cabeza" (Birds in the head). The album was released in 14 May 2005 and they started the tour in June in Salamanca. Afterwards, they continued the tour in Mexico, Chile and Argentina. Amaral made a stop in Barcelona to record the concert and release it on DVD. It was called "El comienzo del big bang" (The beginning of the big bang). "Pájaros en la cabeza" was the most sold album in Spain in 2005, according to the SGAE (Spanish Society of Authors and Publishers).