Francisco Marquez / Penduline tit (Remiz pendulinus) building a nest, Toledo, Spain, May.

Francisco Marquez / Penduline tit (Remiz pendulinus) building a nest, Toledo, Spain, May.

Jussi Murtosaari / European penduline tit (Remiz pendulinus), male perched on willow, Jyvaskyla, Finland, April.

Jussi Murtosaari / European penduline tit (Remiz pendulinus), males, Jvaskyla, Finland, April.

Sven Zacek / Penduline tit (Remiz pendulinus) overwintering in Estonia and searching for food in reeds in Tartumaa, Estonia. January.

Sven Zacek / Penduline tit (Remiz pendulinus) male on nest, Tartumaa, Estonia. May 2013.

Sven Zacek / Male Penduline tit (Remiz pendulinus) building nest at sunrise, Tartumaa, Estonia, April.

Juan Carlos Munoz / Men holding Eurasian penduline tit (Remiz pendulinus) at bird ringing demonstration, Hula Valley, Israel, November 2014.

Filippo Nucifora / Eurasian Penduline-Tit (Remiz pendulinus) male, Switzerland

Jan Wegener / Eurasian Penduline-Tit (Remiz pendulinus), Brandenburg, Germany

Jan Wegener / Eurasian Penduline-Tit (Remiz pendulinus) male at nest, Brandenburg, Germany

Winfried Wisniewski / Eurasian Penduline-Tit (Remiz pendulinus) male on reed blade, Biebrza National Park, Poland