5000 years seems like a bit much. I thought horses came from Eurasia and were brought over by the Conquistadors.
The horses have lived on this barrier island for 500 years, and they are well equipped to deal with rough weather,” Puckett said of the Corolla herd. “They know where to go to stay high and dry and are probably in better shape right now than most of us humans who are scrambling with final preparations.“ Read more here: Some of NC’s wild horses weathered Florence fine. Others still aren’t accounted for yet.
The ark was more like a submarine that housed computer and DNA chips from earth's animals and were then used to recreate the population at a later date.
   I've been waiting for someone to question where i come up with all this shit, but it wasn't ancient aliens. that's just str8 outta Gilgamesh. 
It takes some interpretation to conclude its about dna chips and stuff though. Its like that Eve being created out of Adams rib thing in the bible and the 'obvious' conclusion derived from it by certain folks in this age.
Only some? Lol Yah you only have to account for submarines, microscopic equipment, the ability to traverse the entire earth to access every animal's dna prior to the technology and information actually being invented and discovered.