Drone footage of gray whales captured over seven years off the Oregon coast has revealed new details about how the giant marine mammals find and eat food.

The findings, described in two studies published over the summer, include that gray whales rely on different swimming techniques to collect food based on their size and age, and that larger whales are more likely to exhale “bubble blasts” to help them stay underwater.

“Before this study, we thought that any whale used any of those…