Fruits with fleshy Pericarps attract herbivores who disseminate their seeds . The exudate was used by Hawaiians to trap birds without damaging their plumage. This worked all too well and led to the extinction of some bird species. Pisonia Flowers and Fruit with sticky mucilage Fruits may also have spines or barbs which stick to animals. In some cases the fruits have wing-like projections which help them disseminate as they swirl and fall like helicopters.
Some fruits contain plumes of hairs which assist their dispersal.
Inflorescence of Tragopogon . The individual dry fruits have a Parachute-like plume of hairs. In some cases hydrostatic pressur e develops in the Ovary that acutely leads to the forceful ejection of seeds. Certain cucumbers spit out their seeds. The most famous of these is the Squirting Cucumber.