Shipwrecked boy discovered orang and hyena evacuated with another predator (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

PI (reference the boy shipwrecked in the novel The Life of Pi) + RAN ( letters remaining in O RAN G when the outer letters O and G are removed [dis-covered]) + HA (l etters remaining when the central letters YEN are removed from [evacuated] H YEN A )