Well, that’s sufficiently vaguely-phrased that just something like a pack of wolves or orcas pursuing their quarry for days, which does happen, would seem to qualify. Or the bird building a nest as described below.
FWIW, pregnant African elephants often find a good time and place to give birth around the end of their term and then consume the leaves of a certain tree to induce labor (humans in the area use it for the same purpose). The pregnancy takes over a year and the labor itself, once begun, can take several days.
Well, that’s sufficiently vaguely-phrased that just something like a pack of wolves or orcas pursuing their quarry for days, which does happen, would seem to qualify. Or the bird building a nest as described below.
FWIW, pregnant African elephants often find a good time and place to give birth around the end of their term and then consume the leaves of a certain tree to induce labor (humans in the area use it for the same purpose). The pregnancy takes over a year and the labor itself, once begun, can take several days.