Which is not an observation
a. the dog has brown fur
b. the dog is shaking his tail
c. the dog barked all of last night
d. the dog barked because he is hungry?

i am pretty sure that the dog that barked because he is hungey is the answer

Explanation:

because you can't tell if a dog is hungry or not unless you can speak dog language. and when dogs bark it could mean many different reasons

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.