Just elephants, their feeding, drinking, and dung.
Many sites: ""Adult elephants require an enormous amount of food. Elephants may spend 12-18 hours a day feeding. Adult elephants can eat between 200-600 pounds of food a day. As herbivores, elephants consume grasses, tree foliage, bark, twigs, and other vegetation daily. Elephants can also drink up to 50 gallons of water a day about as much as a standard bathtub holds.""
So two elephants a day Alone need app 800 lbs x 40 days or 32,000 lbs of food.
and 100 gallons of water x 40 = 4000 gallons = another 32,000 lbs.
They poop 8-12 times day each producing 300lbs of Dung x2= 600lbs x 40 days = 24,000 lbs.
That confined would pile up very quickly without a giant amount of dedicated/Not stall or 'just fit' space.
Probably needing app 1 of the arks 3 floors just for them. (app 450x75)
Not to mention Dinosaurs, Rhinos, Giraffes, horse (kinds), Moose, Hippos, Gorillas: (meat for) LIONS, Crocodiles, etc, etc, etc.
IOW, you'd probably need at least 1,000,000 lbs++? of food (and water) for all the animals of any size.
And daily feeding/scooping of tons of dung. A crew of scores of people.
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