EDIT : Venom gives 400 food, has 5h spoil in preserving bin and 2h in dino. Drake will eat at 10-18% of max food (for its first eat). Algorithm: (max food) × .10 or .18 = (first eat). Drake below adolescent drain 1 food per 11 seconds. Drake adolescent or above drain 1 food per 22 seconds. Algorithm: (current food) x (seconds) = (time until depleted).
They lose 1 point of food every 15 seconds, so to time how long until they start starving, multiply their current amount of food by 15 and then divide by 60 twice. This will give you the number of hours left untill the food stat reaches 0.
((15 x food)÷60)÷60
Obtaining this creature will require you to enter the tek trench where puprle liquid and the nests of these creatures lay past the bioluminescent chamber, there you must steal an egg and raise in a cold environment feeding it nameless venom you can get by killing nameless