Birdlime is an adhesive substance used in trapping bird
Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

s. It is spread on a branch or twig, upon which a bird may land and be caught. Its use is illegal in many jurisdictions.

Historically, the substance has been prepared in various ways, and from various materials. A popular form was made from holly
Ilex) is a genus of 400 to 600 species of flowering plants in the family Aquifoliaceae, and the only living genus in that family. The species are evergreen and deciduous trees, shrubs, and climbers from tropics to temperate zones world wide....

 bark, boiled for 10 to 12 hours. After the green coating is separated from the other, it is stored in a moist place for two weeks.