Shrubs to protect poultry

Hi,

i'm thinking about the way to protect poultry (chicken, chicks, ducks) from day time terrestrial predators (like foxes),

for chicken, i think some perchs with barbed wires would be ok,

but for chick and ducks, it would not be possible, i need a terrestrial protection,

so what about thorny shrubs ? In permculture 2, it is said that African Boxthorn would do the trick, but the hardyness (zone 9) does not match with mine (and it is quite invasive),

so have you any  experience with thorny shrubs as protection for poultry ? I think about seabuckthorn, Buffalo Berry  ...

Thanks

Found this online when I was considering species for living fences.

Pyracantha: This thorny evergreen shrub produces red, yellow or orange berries in the fall.
Barberry: Also referred to as "sticker bushes, " these shrubs are characterized by their distinctive three-spined thorns.
Roses: Some varieties of this garden favorite will grow into a dense thicket that is impenetrable to trespassers.

http://www.csoonline.com/article/221247/thorny-solutions-bushes-and-other-plants-that-deter-trespassing

Trifoliate orange is hardy to zone 5.

http://en.m.wikipedia.org/wiki/Trifoliate_orange

Me and another feller have been discussing its merits here:
https://permies.com/bb/index.php?topic=9626.msg100640#msg100640

pyracantha is good because it gives the chickens food and protection. easily kept under control or you can let it get real big. you can make jelly from the berries too.

osage orange is another good one, excellent wood, hardy, other beneficial and useful properties. must be pruned or coppiced and pruned to be kept short like a shrub. otherwise it will want to be a big tree.

wild rose gives flowers for honey if you have bees, suckers heavily to form a thick barrier, rose hips for medicinal and eatable uses.

i prefer the wild rose personally, we have 3-4 different types around here. i like to plant the wild rose on the outside and then eatable chicken plants on the inside. this keeps the deer from eating them up.

Thanks for the advices,

i have pyracanthas, but our poultry does not consumme the berries ... yet ?

About sea buckthorn, the most thorny cultivar seams to be Leikora (which does not sucker a lot)