The mass of an object is defined as the "amount of "matter" in an object, whereas weight is the force exerted on an object by gravity".
However, I often see in scientific literature the adjective "large" associated to mass/weight, such as "this animal is larger than another", or "small animals". Is this correct or would "heavier" be the correct adjective to use?
Mind you that volume is never discussed in these texts, they always discuss mass/weight in Kg. This trend can be observed in top scientific journals such as Science or Nature, so what would be considered the most authoritative scientific references.
Maybe this applies also to other contexts.
EDIT: I am not interesting in discussing the difference between mass and weight. I am wondering why authors are using "large animal" when there's no volume or size involved, instead they mean "heavy animal".