Invasive versus native

Hey there, Anyone interested in sharing their stories with an encounter of an invasive species being attack by a native species or vice versa with picture if possible.

After 20 minutes, the Goldenrod Crab Spider gave up her meal (Japanese Beetle) to my total dismay, I guess the Japanese beetles are here to stay.


I can’t talk about it. It makes me sad that we are judging the value of critters who didn’t ask to come to their new country.

It’s basically taxon-ist.

Shame on us.

I am joking, but only slightly.



Actually a hard task, it’s easier to find introduced on introduced! Here’s a squirrel with a Manchurian walnut.

12 Likes Native ant dragging invasive bee


Native Natrix maura feeding on invasive Lepomis gibbosus


Invasive eating invasive is definitely easier for me to find on iNat. Here’s an example of one I found yesterday from Florida with an invasive giant ameiva eating an introduced brown basilisk, two species I don’t find all too often on iNat, nevertheless both in the same observation!


And then we have the native otter Lutra lutra which seems to feed here exclusively on the introduced red crayfish Procambarus clarkii. I only find the scat, which I haven’t photographed (so far). I suppose I should.

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Solenopsis invicta (invasive) attacking Chloridea virescens (native).

Leptoglossus phyllopus (native) feeding on Lonicera maackii (invasive).

Anolis sagrei (invasive) eating Erythemis simplicicollis (native).

Vespa crabro (invasive) attacking Leptoglossus phyllopus (native).


Here are few of mine.

A House Sparrow (invasive) eating a probable Two Striped Grasshopper (native)

A Common Red Soldier Beetle (invasive) doing…something in a False Sunflower (native)

A Jagged Ambush Bug (native) eating a European Common Blue (invasive)

And finally,

Dermestes undulatus (invasive) breaking down a diseased American Robin (native).


It has nothing to do with their place of origin, it’s their negative effect on the local ecosystem that makes them bad.


Can you find a definition of ‘invasive species’ that doesn’t mention them being from somewhere else? As in, something to do with their place of origin? I can’t. Nat Geo, US DOI, US NOAA…not exhaustive, but I’m stumped! Please help.

I would use Aldo Leopold’s definition - “A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends otherwise.”


That’s pretty cool, although it sounds to me like the difference between ‘pest’ and ‘not pest’ regardless of origin.

As far as I can work out, ‘invasive’ specifically relates to ‘something from elsewhere’, which is also a ‘pest’.

Technically speaking, an organism does not need to be from somewhere else to be invasive - native species CAN be invasive. This is very rare, but it can happen.

I saw mention of that, but just put it down to the current fad of deconstructing absolutely every word in the dictionary.

Do you have some examples of native invasives? I’d be interested to know how it actually works in practice.

A good example is White-tailed Deer in eastern North America. Due to a lack of predators, they are eating away entire forests and extirpating entire plant species. They are a huge problem for both forest health and human populations (since car crashes can easily cause death). If they aren’t invasive, I don’t know what is honestly.


It’s a contradiction in terms. It’s saying that something invaded an area to which it is native. Cambridge dictionary defines “invade” as “to enter an area of activity in a forceful and noticeable way.” Meaning that entering is essential to the definition of invading. A native species cannot be said to be entering.


That’s what I would have thought. It is an oxymoron, yet here we are.

Typically considered invasive here, but here from natural spreading into new areas where they “should not” be. Even the freezing winters dont seem to be stopping them from spreading northward as was originally thought.

White tail deer I agree is a good example here. And then in comes chronic wasting disease. I would say they are forcibly & notably entering plenty of areas they shouldn’t be.

But in any case i think thats why the phrase usually is not “native invasive” but “natives acting invasively” which certainly happens when things are unbalanced.


They sound like a pest for sure. Why are they considered invasive? What is the minimum distance or obstacle that needs to be traversed or overcome before some critter is considered alien? That would surely help to define what is considered properly invasive.

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