Here's how TNR-MATH works:
"In NYC there are currently 465 registered TNR colonies. When TNR began in these colonies, 6047 cats were present – today, there are 4523 cats present, a decline of approximately 25 percent." (Quoted from an Alley Cnt Allies member who was SO proud of this.)
Apparently, if you TNR 4 cats and 3 die from being flattened by cars this is a 75% decline of feral-cats statewide.
Of those 6,047 cats they've only REDUCED the total by 1,524 cats, about 127 PER YEAR. That's only 0.08% of the 1,806,310 feral-cats within the city's limits.(data taken direct from TNR-advocates' own resources)
Guess how many have been born IN JUST THE LAST 6 MONTHS (hoping like hell that they're not breeding every 4 months). Let's do the math...
(1/2 total = females) 903,155 X 5 (avg. number in a litter)= 4,515,775 NEW CATS. Which lowers the number of them that have been reduced by TNR idiots to only 0.024%. THEY ARE GOING BACKWARD.
Guess how many will be born in another 6 months?(4,515,775 / 2) X 5 = 11,289,438.
Remember. the first 903,155 females are still breeding. For another 4,515,775. Add in the pre-existing 1,806,310, bringing the grand total in just ONE YEAR to 17,611,523 CATS. Which means that TNR groups have only reduced the cat-population by 0.008% of them. That's not even 1/100th of 1%.
Alley-Cat-ALL-LIES can't even reduce cats in their own city, yet they promote it as a worldwide solution. Then even bigger fools fall for it and promote it.
[Note: this recursive calculation population-growth problem actually requires advanced calculus with many more variables and will result in differing numbers; some higher, some lower, depending on how many years you do the population-growth projection when using both methods; but the results are just as astoundingly large no matter which method you use. I only include the dumbed-down version here so those of you with at least half a brain can comprehend and do the math yourself. Besides, it doesn't matter how many feral-cats are roaming free. If even ONE invasive-species cat is roaming free and has destroyed even ONE native animal, then that invasive-species cat must be destroyed. These numbers are only important to alert all others to how many cats must be destroyed and if they'll ever have the financial resources to do so by using their preferred method. In most cases, every municipality must allocate anywhere from 1/10th to 1/2 $BILLION PER YEAR if employing TNR costs just to catch-up to their breeding rates -- sustaining that expense YEARLY into perpetuity. Whereas shooting them results in costs substantially lower, in the range of $2,000 to $75,000 for 1 year. Which ends up being a ONE-TIME-EXPENSE. Something that is attainable by the tax-base in most every area.]