V. robustus has been estimated to have obtained lengths up to 5 m (16.4 ft) and a weight of 170 kg (375 lbs). These estimates suggest that V. robustus was the largest predator to have existed in Madagascar in recent times. Its size, stature, and presumed behavior is similar to the modern Nile crocodile (Crocodylus niloticus). Because V. robustus shared so many similarities with the Nile crocodile there must have been a great deal of interspecific competition for resources between the two crocodile genera if they were to have coexisted with one another. It has recently been proposed that the Nile crocodile only migrated to the island from mainland Africa after V. robustus had become extinct in Madagascar. However, this was subsequently disproved after some Crocodylus specimens from Madagascar were found to be over 7,000 years old and contemporaneous with Voay.
