Pyracantha is used down saaaarf to keep unsavory individuals OUT . Flowers white berrys later the birds love it , bees love it neighbors hate it ....... sounds a bit like marmite
The only thing is you won't get any eggs for a long time off the £5 ones were as the £15 ones will start laying in a few weeks, but you will Get to know them better and tame them more
I planted half a dozen in my hedgerow not only spiked but evergreen too. the one outside my office window now established is rampant.
I planted a bustle in mine to attract Jimmyus Pageus alas it only attracted a Johnii Bonhamii and I was drummed out of the local garden society.