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.
Chipmunks are small mammals with distinct stripes, while the tree squirrel is larger and doesn't have stripes. The ground squirrel has body stripes like chipmunks, but no head stripes. A tree squirrel is larger, has a longer tail and no stripes. They all have short fur and small rounded ears. Chipmunks range from 6 to 12 inches (16 - 30 cm) in length. Ground squirrels range from 8 to 12 inches (25 - 30 cm) in length. Tree squirrels are 12 to 20 inches (38 - 52 cm) in length, including the tail.