The Global Invasive Species Database (GISD)
www.issg.org/database/welcome/
xeno-canto Europe, the community database of shared bird sounds from Europe.
www.xeno-canto.org/europe/
Birding India on House Crow
www.birding.in/birds/Passeriformes/Corvidae/house_crow.htm
Arkive images of House Crow
www.arkive.org/house-crow/corvus-splendens/images.html
CABI Invasive Species Compendium
www.cabi.org/isc/
Oiseaux house crow images and other information (in French)
www.oiseaux.net/birds/
Avian Web on House Crow
www.avianweb.com/housecrows.html