He does have a point though--iguana corpses were piling up, but very few burm corpses were found--even though we know most of the microchipped animals died, so the death toll must have been high. If their numbers out there were really that great, there should have been more. The vultures had a HUGE feast, but there was so much death, the scavengers couldn't keep up with it all...alligators, crocs, tropical fish, iguanas, etc etc. People saw corpses everywhere.
Conclusion, there were never many Burms out there to begin with.