Boa constrictor
The size adult animals reach varies among subspecies. The largest animals have been found in Northern south America. Two animals from Suriname are currently the largest on record: One reached 411cm (13.5 ft), the other 427cm (a bit over 14 ft). Such sizes are rare, boas reaching 3m are considered large. There is a report of a boa reaching 5.6m in Trinidad, but it is believed that snake was an anaconda,Eunectes murinus, taken for a boa.