http://stopabductions.com/
They claim that the aliens are less dexterous than humans. "One abductee foiled an abduction by having her husband wrap her with string and subsequently hiding the scissors. The aliens could not remove the string and did not take her. Aliens have not been able to remove a thought screen helmet secured with tape or string. "
a drawing by a child abducted by aliens
http://www.aliensandchildren.org/
Supposedly abductions of children have been going on for centuries as represented in the folklore, fairies stealing babies, the changelings, etc. (Jacques Vallée, Salvador Freixedo.)
