In 2012 Apple decided to drop YouTube from the set of native apps with introduction of iOS 6 and soon after Google released its own app, which since has gone through 11 major iterations and today proudly sits on the third place of the Top 10 Most Popular iOS apps.
Some species of squirrels may claim as much as 10 hectares of territory. Because of the high density of squirrels in most habitats, there is sometimes significant territory overlap. Squirrels mark their territory with urine and tail-waving displays, and they may bark warning calls at passing intruders, including humans.
Female fox and gray squirrels that are at least two years old have two litters per year, younger females have only one litter per year. Average litter size is two to four (southern flying squirrels may have litters of up to seven young), with young weaned around eight weeks of age.