Current estimates would be most improved with better knowledge of feral cat numbers and the prey they take. (catsandbirds.ca)
The spay / neuter campaigns brought about a general decrease in cat number but the percentage of cat immigration (due to abandonment and spontaneous arrival) is around 21 %. (voxfelina.com)
Only 15 - 30 percent of dogs that are lost are reunited with their owners and for cats the numbers fall to less than 5 percent. (atlantahumane.org)