Well when Cook turned up they'd not had fresh rations in months. So Lieutenant John Gore did them the service of swiftly shooting one of the big rat creatures. Captain Cook's journal said "Today we dined of the animal shot yesterday and all thought it excellent food"

So they thought "yum!" edible bouncing rat. I am sure it was a nice break from salt pork or beef and hard tack..

Here's a direct transcript of Cook's observations on the Kangaroo's appearance and of eating them, 14 July 1770. http://southseas.nla.gov.au/journals/cook/17700714.html

we dont know, because there are no records