Hi SB,
we had a farmer about 2 miles from us farming ostrich a few years back, during one or two visits to him I discovered the following :-
1) You need REALLY high fences - I think his were 8 ft, maybe even higher
2) They don't like the wind much, so field shelters are essential, he also had lined the fencing with enviromesh type stuff.
3) They can be quite aggresive, he had tonnes of warning signs all over the place urging people to stay back from the fence. If the field in question was on a well used path you might have to adopt the same strategy (and take out some public liability insurance for the numpties

)
Said farmer however, is no longer keeping them. It might be something to do with his rumoured arrest for collecting up all the telegraph poles which had been taken out by BT and left lying at the roadside - he saw superb ostrich fencing, they saw unlawfull theft

Good luck whatever you decide, keep us posted
