Mothers struggle when oceans warm too much.

When seas warm, the food web changes — and that hits whale mothers hardest. As their prey becomes scarcer, pregnant and nursing females can’t get enough nutrition to feed themselves and their calves. The result: lower birth rates, weaker babies, even starvation.
This crisis is not hypothetical. In recent years researchers have documented rising starvation and mortality among whales, especially in populations whose feeding grounds have been altered by marine heatwaves or shifts in prey distribution. Below are ten ways this phenomenon shows up — and what the science is revealing.



