While in Malta, I was lucky enough to catch the mating season of the Eurasian Collared-doves. It sounds like good planning but really, these birds' mating season lasts for 75% of the year so it's hard to find them not pursuing each other.
Doves and pigeons are incredibly prolific when it comes to reproducing. If you've ever wondered why there are so many pigeons--*ahem* Rock Doves--in the world, wonder no more. Their long breeding season and rapid growth in the nest allow them to populate the world at an alarming rate.
Most dove species inhabit their ecological niche much like any other bird does, varying in rarity. Eurasian Collared-doves lay only two eggs per brood but they can raise up to 6 broods per year. And the chicks leave the nest after only 15 days. That's an unnerving transformation from featherless weakling to adult-sized bird in such a time.
If you're curious about whether there were pigeons in Malta, of course there were. They're everywhere. Get used to it.