Where the carcase is, there will the eagles be gathered together.

People tend to gather where they see something worth pursuing. The image of birds converging on a carcass makes that attraction seem predictable rather than surprising.

The proverb can also cast the gathering in an unflattering light: those who arrive may be seeking a benefit from another's loss. That implication depends on whom the speaker is describing.

Use it when several people converge on the same opportunity or object of interest, particularly if their motives seem self-serving. The stark image can sound accusatory, so it is less suited to a neutral description of a crowd.