Haven't there been sightings of some of the larger avian species at over 30000ft? Admittedly somewhat lower probability of hitting one, but something the size of a swan or goose would make a bigger mess at Mach 0.8 or more.
Since 1st Jan 2007 all avian species with a mass greater than 2 kg flying in RVSM airspace are required to be fitted with a functioning mode S transponder, TCAS and also fully trained to deal with TA/RAs as notified by EU directive AV/SPEC/SQWAUK/SPLAT 2007/ SI 95 (BS). France have notified a difference prohibiting all avian species movements in the French UIR.