About: http://webisa.webdatacommons.org/38256204

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They are placed on vertical surfaces near water under cliff ledges or more commonly on man-made structures such as buildings and bridges.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org