Invasive is such an ugly word, isn’t it? An invader, after all, is nothing if not unwelcome. Even the word “invade” describes intrusions described colorfully as forceful, hostile, destructive, and even injurious.

Interestingly, the birding lexicon uses other terms to describe unanticipated arrivals in more positive terms. For example, to irrupt, at least as far as animals are concerned, is simply to enter a region suddenly and in very large numbers. In the same vein, to expand means to increase in extent and scope or to spread out. Sounds so innocent, doesn’t it? One wonders how innocent the Spotted Owl finds the rampant range expansion of the Barred Owl.

Perhaps our outrage at invasive species can be a bit hypocritical at times. What would birding be without the prospect of twitching the occassional vagrant, which is by definition an uninvited, though in these cases welcome, guest. Listers are quick to put aside their condemnation of invasive species once they attain that coveted status of exotic: not native, not fully naturalized, but established well enough to be countable by the prevailing authority.

If you can accept the natural world as a completely free economic market, invasive species tend to be wildly successful entrepreneurs, capable of nimbly exploiting opportunities and competitive advantages fpr massive profit. The rapid proliferation of the European Starling is, on the species level, equivalent to incalculable fortunes of billionaire moguls. Sure, capitalism demands losers as well as winners, but that’s not the starling’s fault.

Of course, there’s no such thing as a truly free market and even the natural world is subject to regulation. That’s where we come in. In instances where invasive species are truly destructive, we must be vigilant and swift in beating back the invaders and restoring the natural balance. But as we learn time and time again to our dismay, the arrogant attempt to decide who wins and who loses in a complex system is typically exactly what destabilizes that system suffciently to allow unexpected, often unfortunate outcomes.

This is probably too much to think about every time you encounter what we consider an invasive species. But when you meet one in the field or as you read our exceptional collection of essays discussing different aspects of invasive species all over the world, have some sympathy and some taste. Like them or not, in the great game of life, these are winners.

Below is a full list, with hyperlinks, of each and every one of our Invasive Species Week posts. We hope you enjoyed them all but if you missed any feel free to click on through. Thanks to all of our guest posters, as well as all of the Beat Writers who participated. We think the week was a rousing success and hope you agree!

Welcome to Invasive Species Week! – Alien Species – Rose-ringed Parakeet – The Charge of the Egyptian GooseHill Mynas in MiamiGrallards: New Zealand’s Next Extinction or Newest Species?Greater Rheas: Germany’s new Big Bird –  Feral Pigeons World WideNew York City’s First Eurasian Collared-Dove –  The Eurasian Collared-Dove Explosion: Coming to a Town Near You!Acclimatisation Societies of New Zealand –  The Cattle Egret Expansion –  Feral Cats Are An Invasive Species in North America (and elsewhere) –  It’s a Myth – Isn’t It? –  The Parakeet of City Streets, the Monk ParakeetEmerald Ash Borers vs. Woodpeckers (and Nuthatches) –  Birds Threatened by Asiatic Sand Sedge Invasion on Long Island –  Invasive species in Australia – Noxious: Montana’s Battle With Spotted Knapweed, and What Birders Can Do

Invasive Species WeekHere at 10,000 Birds 20 July – 26 July is Invasive Species Week. We use the term “Invasive Species” in the broadest sense, to encompass those invasive species that have expanded beyond their historical ranges under their own power, by deliberate introduction, or by unintentional introduction. The sheer number of species that have been shuffled around on our big earth is impressive, though we will be dealing with the smaller sample size of invasive avians and other invasives that effect avians. Nonetheless, this week will be chock full of invasive species. So batten down the hatches, strap on your helmet, and prepare to be invaded! To access the entire week’s worth of content just click here.

Written by Mike
Mike is a leading authority in the field of standardized test preparation, but he's also a traveler who fully expects to see every bird in the world. Besides founding 10,000 Birds in 2003, Mike has also created a number of other entertaining but now extirpated nature blog resources, particularly the Nature Blog Network and I and the Bird.