Changes

Balloon flies are members of the species ''Hilara'', who have evolved a complex mating ritual involving the giving of a large white balloon as a gift.

'''Balloon flies''' are members of the species ''Hilara'', who have evolved a complex [[mating ritual]] involving the giving of a large white balloon as a [[gift]].

In many species, females will only mate with males who come to them bearing gifts. Males who don't deliver the goods are rejected, and males bearing small gifts may only be given a short time in which to copulate.  

In many species, [[female]]s will only mate with [[male]]s who come to them bearing gifts. Males who don't deliver the goods are rejected, and males bearing small gifts may only be given a short time in which to [[copulate]].  

In the case of balloon flies, the male offers the female a large white balloon. Original research was carried out on this by Kessel in 1955 and published in Kessel, E. L. 1955. The mating habits of balloon flies. <ref>Diptera: Empididae). Syst. Zool. 4: 97-104.</ref>

In the case of balloon flies, the male offers the female a large white balloon. Original research was carried out on this by Kessel in 1955<ref>Kessel, E. L. 1955. The Mating Habits of Balloon Flies. (Diptera: Empididae). Syst. Zool. 4: 97-104.</ref>

Like many evolutionary sequences, this ritual seems to have become more complex over evolutionary time. Other species of the same family of dance flies, the ''Empiidae'', to which the balloon family belongs, display mating behaviours that seem to point in the direction of the behaviour shown by the balloon fly.  

Like many [[evolution]]ary sequences, this ritual seems to have become more complex over evolutionary time. Other species of the same family of dance flies, the ''Empiidae'', to which the balloon family belongs, display mating behaviours that seem to point in the direction of the behaviour shown by the balloon fly.  

Some species mate in a haphazard manner – males approach females, who sometimes mistake them for prey rather than potential mates and eat them – the ‘pick her up in the pub and risk getting your face slapped’ approach.

Some [[species]] mate in a haphazard manner – males approach females, who sometimes mistake them for [[prey]] rather than potential mates and eat them – the ‘pick her up in the pub and risk getting your face slapped’ approach.

Other species avoid this hazard by distracting the female by offering her a prey item and then mating with her while she is consuming her meal – the ‘take a bottle of wine to her house while she cooks you dinner’ approach.

Other species avoid this hazard by distracting the female by offering her a prey item and then mating with her while she is consuming her meal – the ‘take a bottle of wine to her house while she cooks you dinner’ approach.

Some members of the species ''Hilara'' wrap the prey item in silken threads in order to subdue it before presenting it to the female – the ‘take her out for a slap-up meal’ approach.

Some members of the species ''Hilara'' wrap the prey item in [[silk]]en threads in order to subdue it before presenting it to the female – the ‘take her out for a slap-up meal’ approach.

More advanced members of the species ''Hilara'' create a complex silken balloon that is either empty or contains a piece of vegetation - the balloon itself becoming more important as a signal of courtship – the ‘give her expensive gifts’ approach (because the creation of the silken balloons takes it out of the male balloon fly, reproductively speaking, as it consumes a lot of energy).  

More advanced members of the species ''Hilara'' create a complex silken balloon that is either empty or contains a piece of vegetation - the balloon itself becoming more important as a signal of courtship – the ‘give her expensive gifts’ approach (because the creation of the silken balloons takes it out of the male balloon fly, reproductively speaking, as it consumes a lot of energy).