The amazing abilities of the Darwin's bark spider are on high-definition display in a video that shows this tiny spider wafting more than 80 feet (25 meters) of webbing across a river. Darwin's bark spiders (Caerostris darwini) were discovered only in 2009. The spiders spin initial connecting threads that are up to 82 feet (25 m) long to suspend these webs from vegetation on either side of a river or other body of water.