Iris seeds and birds

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      All I found was this paragraph from this site
http://flower-iris.ru/en/knigi-pro-iridariy/zaglyanut-v-knigu/59/

 "The resumption of the genus Iris populations is due to seed and vegetative propagation. Iris seeds can be spread by water, wind, ants, birds and various animals. Thus, the distribution of seeds and fruits of most species of the subgenus Limniris happens with water. They nonwetting epidermis and pneumatic cavities. There are species that are distributed ballistic seed dispersal, ie species which boxes to erect stems crack at the top and fall on the ground only when swinging. So spread easily because in bristle and winged seeds because of the Siberian. Types of sections Onkotsiklyus (Oncocyclus), and Psammiris (Psammiris), the seed of which develops a fleshy appendage, distributed, probably ants. Vegetative propagation is due to iris rhizomes."