Mean daily number of kills observed per five-day period in the eastern Beaufort Sea between 1985–2011.

<p>4a: Mean daily number of all kills observed (± SE); error represents combined daily and annual variation in observations. Grey shading indicates peak ringed seal whelping in the Beaufort Sea <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0041429#pone.0041429-Smith1" target="_blank">[12]</a>. 4b: Mean number of ringed seal pup (0+ years), juvenile (1–6 years) and adult (≥7 years) kills observed.