why generic failed?

feed monkey with banana(s).scala

class Banana

object Monkey {
    def eat(bananas: Seq[Banana]) = println("lots of banana")
    def eat(banana: Banana) = println("one banana")
}

object Person {
    def pickBanana = new Banana
    def pickBananas = List(new Banana, new Banana)
}

object FeedMonkey {
    def feed[T](food: => T, eat: T => Unit): Unit = eat(food)

    def main(args: Array[String]) {
         //below lines are failed
        /* error:ambiguous reference to overloaded definition, both method eat in object Monkey of 
     type (banana: Banana)Unit and  method eat in object Monkey of type (bananas: Seq[Banana])Unit match expected
     type (?) => Unit */
        feed(Person.pickBanana, Monkey.eat)
        feed(Person.pickBananas, Monkey.eat)
    }
}