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.
Survival of young in tree cavities is higher than for those in leaf nests. Female squirrels are very territorial in protecting their nest when they have young, but will sometimes nest with close relatives during the winter. When squirrel babies are ready to leave the nest, they do so gradually. They may spend a couple of days practicing running up and down their den tree and in and out of the nest, before they ever take that first big jump to the ground.