Another hypsil-type animal. Agilisaurus and Hexinlusaurus appear to have lacked ossified tendons on the tail, an absence which would have made their tails much more flexible than most other ornithischians (as restored on both drawings).

Yes, in deed, in many bird species, the tail is avery significant communication medium. However, usual currents vbeleive that smalissh herbivores such as hypsilophodontids would most likely live in packs, such as zebras do, so dominance would most likely to be asserted trough fighting or by body threatening/displaying and therefore the dominant alfa male (or female for that matter) would most likely breed freely and wouldnt need additional displaying features such as a male's bird of paradise tail.