exhausted despite feeding, mother harbor seals clearly cannot support all of lactation using only energy stored before giving birth. Though smaller

than many other phocids, harbor seals are similar in size to most otariids. In addition,

there is already some evidence suggesting that the ringed seal, a phocids species that

is similar in size to the harbor seal, may also use a maternal foraging strategy.

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pheromones是什么东东
，是不是该划为odorant

There is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify that the response to pheromones must be unconscious. In addition, the distinction

between pheromones and odorants—chemica