There are other tactics. Dippers forage underwater in fast-moving streams. Common grackles have been observed to follow farmers’ plows to glean the grubs exposed in the fresh soil. Similarly, on the island of Borneo, the Bornean ground-cuckoo will follow wild pigs and sun bears as they turn up soil while foraging in the forest. Brewer's blackbirds are often seen in parking lots, where they pick off dead insects from car grilles. Some hummingbirds are known to take prey items from spiderwebs.