So not only do the birds not ‘see’ an approaching golf ball, they seem to absorb the impact surprisingly well and live on to face the foxes which, judging by the bones and feathers, kill and eat a good number each year.
*DeVault TL, Blackwell BF, Seamans TW, Lima SL, Fernández-Juricic E. 2015 Speed kills: ineffective avian escape responses to oncoming vehicles. Proc. R. Soc. B 282: 20142188. http://dx.doi.org/10.1098/rspb.2014.2188