My family used to have a cat named Kitty who tried to get into boxes much too small. She would lie down in a shoe box and overflow on every side!
This brought back some happy memories. Kitty is gone, now.
They can - if you're a cat !
From the comments under MM's site
[bad img]http://i.imgur.com/Gw3v7.gif[/bad img]
[bad img]http://i.imgur.com/QHpclYt.jpg[/bad img]
And now we have mail order cats!
(from your first image Scholar)