Depends on the child. DS4 was scared from about 18 months to 3 years. Prior to 18 months he could have cared less about anything to do with the restruant (enjoyed or disliked. This is the same child who is afraid of fireworks, unless at a distance (still). DS 21 months, could care less about the animals and the noise. He enjoys it.
If you are going to RFC at DtD, then try the gift shop. If it is scary, asked to eat out on the patio (if you still want to eat there)--not sure if there is a similiar option at AK. Or ask to sit at a distance from any animals.