Night of the Hyena

An American family survives back to back world pandemics, travels to distant lands and works to form a sane society. However, wherever they go, there skulks the most devastating enemy of all.
… The educator stated, "Some have elected to stay and we wish them the best, but we think that a great fishing industry could be carved out at Dar es Salaam. We think we can develop a better market on the continent." …
Several of the Minsk people seemed startled when Da'ud asked, "How do you hope to get there, seeing that your ship does not run and you have no skilled mechanics?" …
… About that time the educator had noticed armed female hyena hunters drifting into sight, eager for action, but he replied smoothly, "Of course that is our wish; I cannot see what has disturbed my colleague so much. If only we could pay you, but..."