+1 and don't forget about habitat destruction from draining wetlands to turning fields into farm lands... Some so called protected wetlands are so polluted with heavy metal e.g. cadmium, selenium, birds are being pisoned to death and reproduction is severely compromised. Wetlands along the migratory path are destroyed because well, its not used for roosting. So how are birds supposed to go between summer nesting grounds and winter grounds??
Yes, cats left outdoor will kill suprisingly large number of birds. If the birds are endangered, it can be very devastating. Don't blame the cats. They are doing what comes natural to them. If you introduce a ferral specie into an environment, YOU need to make sure it doesn't cause a problem. Be it Python, African Bull frogs, ferral pigs, goats...
I've heard of stories where a developer has brought in a falconer to erradicate a flock of threatened bird species off the land he wanted to develop. Since falcons are considered "wild" the developer used a loophole in wild life protection.
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I work very closely with a cat rescue group.
1. YES. We will screen you very carefully.
2. YES. We will do a home check and occasional suprise visit.
3. YES we do take adoptions very seriously. If you are not serious about FOREVER pet, don't even think about adopting. They are others who are very commited to having a FOREVER pet.
4. YES we get jaded at people. We see large segment of population who see pets as accessory to their lifestyle, another pair of shoe... Adopt out a dog, cat as puppies and kittens and dump it off at shelter 6 month later or worse dump them off at a local park thinking that the animals will do alright. They don't. Many of them starve to death because they can't compete with the true ferrals. And yes, we do work with animal control.
Don't blame the cats, dogs, parrots, hamsters... snakes. Blame the irresponsible owners.
Oh more threatening species are:
lion fish in the carribean (4 escaped from a private collection after hurricane Andrew was it) NOAA report
Zebra mussels in the great lake region.
Lamprey also in great lake region.
Carp in Mississippi eco system...
Bullfrogs (african native) all across US
Pythons in the Florida everglades.
Ferral pigs, goats around the world.
And don't forget the EARTHWORM in places like Wisconsin, Minn. (When the glacier came down, it scraped the landscape clean and when they receeded, the ground was free of earthworms. They are feral specie. and causing havoc with the local fauna.Minn. Dept of Natural Resource PLEASE READ THIS IF NOTHING ELSE!!
If you see a bullfrog. Please kill it humanely. They are extremly destructive with no predators in North America.




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I was taught earthworm, good for the soil.
