| Insects usually, overwinter, as pupae. | |
| Insects usually, overwinter, as pupae. | |
| These have overwintered buried in the mud at the bottom of this frozen lake. | |
| Huge shoals migrate from their overwintering grounds in the depths to feed in these rich waters. | |
| The latest results confirm that this population commutes each year from Oregon in the north to Mexico and Costa Rica in the south, with many whales overwintering in the Gulf of California. | |
| To reach their overwintering grounds in India they must cross the Himalayas. | |
| These have overwintered buried in the mud at the bottom of this frozen lake. | |
| Huge shoals migrate from their overwintering grounds in the depths to feed in these rich waters. | |
| The latest results confirm that this population commutes each year from Oregon in the north to Mexico and Costa Rica in the south, with many whales overwintering in the Gulf of California. | |
| To reach their overwintering grounds in India they must cross the Himalayas. | |
