Possible Clues:

• Cousins of kangaroos
• Certain Australian boomers (male) and flyers (female)
• Animals with young losing head, going under barrier
• Fools adopting a billion animals
• Aussie beasts
• Pouched jumpers in which silly people dress sailor
• Did they get England hopping mad at Twickenham last month?
• Jumpers with large pockets