Their vehicles are variously pictured as birds, horses, ships, etc.

It is to be noticed that in no one of their attributes are the Acvins unique.
Other gods bring sweets, help, protect, give offspring, give healing medicines, and, in short, do all that the Acvins do.

But, as Bergaigne points out, they do all this pacifically, while Indra, who performs some of their wonders, does so by storm.

He protects by not injuring, and helps by destroying foes.

Yet is this again true only in general, and the lines between warlike, peaceful, and 'sovereign' gods are often crossed.
* * * * * FOOTNOTES: [Footnote 1: Such for instance as the hymn to the Acvins, RV.ii.39.Compare verses 3-4: 'Come (ye pair of Acvins) like two horns; like two hoofs; like two geese; like two wheels; like two ships; like two spans'; etc.