Right now on Vancouver Island were fighting a loosing battle with 2 invasive species - Bull frogs and Scottish broom. About 20 years ago a restaurant on the North end of the Island re least its bull frog breeding stock into the wild (about 10 pairs of bull frogs). Now there are 1000's of them and they have spread half way across the island and as they traveled they petty much wiped out all the other frog and toad species that were native to the island. It really throws the food chain off balance so it's a real problem. The Scottish broom was brought to the Island about 50 years ago and it's really spread and killed a lot of native plants along the way.. Cheers and happy weekend!
And just to add to this.. since we were mentioning Didge.. we DO have to accept that in the case of Australia that's a whole different story when it comes to cats having an adverse impact on wildlife.. it is WELL acknowledged that cats there, in AUstralia cause significant impact.. there are good reasons for this.. .and I don't claim to be an expert but I believe it's something to do with marsupials, mainly.. I am sure DIdge will correct me.. marsupials whch are a feature of Australia cannot cope with predation such as happens with cats.. they have no defences.. birds can fly.. but marsupials are way more vulnerable..
Personally as a CAT LOVER I would advocate that in the more delicate and sensitive setting of Australia ALL cats should be kept indoors/outdoor enclosures to minimise the impact on the delicate wildlife.
I ask a favour.. if i get a comeback on this please someone alert me... as I don't always see replies.. equally if someone just wants to discuss this with me.. please feel free to contct me.. but I stand by what i've said.. simply cos it is the truth.. and it's important that people not be misled..
I leave you with this... from the RSPB.. to those who don't know RSPB is a very respected organisation in the UK.. heavily involved with conservation... advocates particularly of birds.. they say no proof, no scientific evidence and indeed I know from my interest in conservation that many of the endangered (red and amber species) are actually IMPROVING in numbers and the thinking is that the ones who can adapt to more urban environments are thriving BECAUSE of gardens and people puttign food out.. since urban environments are where most cats are.. the numbers are still growing despite these terrible hunters as some put it..
One last thought.. cat's don't only kill birds, arguably birds are harder to catch than mice.. cats DO catch mice.. and rats.. and if we are being factual here.. MICE and RATS can and DO pass diseases... mice damage houses.. rats can cause leptospirosis... there is an argument in the UK for cats being useful.. that IS what they were originally kept for... to control mice and rats... so while in some countries cats are a menace to delicate ecosystems.. that's NOT the case in the UK... facts is facts...
PS my doofus cats couldn't catch a bird if they tried.. they have an enclosure in the garden.. a pidgeon got in.. there were three cats one bird.. lots of feathers where the bird tried to get out.. but the cats just sat and stared at it... until I let it out.. poor understanding of cats is understandable.. but please learn.