I'll play Noahic Advocate for the moment...
God called the animals, Noah didn't gather them.
As far as care and feeding, several possibilities make it asomewhat easier a task...
First, the animals on the Ark could have been babies.
Second, many could have been hibernating.Since most Creationists stipulate some level of microevolution, it might not be necessary to have two African and two Indian elephants. Having a pair of babies requires far less space and food.
Birds fly and penguins swim. Stick with Kangaroos on this one.