Aren't most animals sentient? Wiktionary says that it means "Experiencing sensation, thought, or feeling". Even simple animals like flies are capable of "sensation", and most complex animals experience all three. I would say "sapient" ("possessing intelligence or a high degree of self-awareness") in this context.
You're the scientist, what is the scientifically correct/used/accepted meaning of "sentient"? Or has it been found that most animals do not, or at least do not consciously in the way humans do, sense, think, or feel? Correct me if any of what I'm saying is wrong.
US defaultism
this is a US thing only