British Parakeet Explosion: a Gardener's Concern? by Carol King

I was reading an article about the rose-ringed parakeet which is taking over parts of Britian.  The parakeets escaped or were intentionally released from cages and have survived and begun to thrive. "So what does this have to do with a gardening blog?", you might ask. I saw this one statement speculating about why they are procreating at such a phenominal rate:
"Is it that gardeners are planting more exotic ornamental plants, effectively providing imported food to match an imported bird species?"
So speculate on that, dear gardener.  Another argument for native species!
Heres the whole article.