Who knew that a tiger could be so expensive? Boxer Mike Tyson spends more than $4000-a-month caring for his ferocious pet (not to mention the grand it costs to insure the animal). That's just one of Iron Mike's hefty monthly expenses listed on this accounts payable ledger filed recently by the ex-champ in connection with his ongoing divorce case against Monica Turner. Tyson, who claims in Maryland Circuit Court filings to have severe financial problems, listed such tabs as $65,000 for limousine rides, $2800 for lawn mowing services, and $28,000 on Mike's American Express card. But along with Tyson's outlandish expenses, there's one payout for which he can be saluted. That's the $13,000 he paid for the monthly home care of 96-year-old Camille Ewald, the longtime partner of late boxing trainer Cus D'Amato. Though not related, Tyson has referred to Ewald, who died last year, as his mother. (1 page)