Not all publications provide a fencing height for each genus however, where heights are provided for a specific one, there is commonly a large range in the suggested fencing height (Table 5 ). The range for the above-ground height for fencing for each genus is often more than 20cm. Only three publications provided specific recommendations for lizards but the difference in height between these is 77cm (33cm – 110cm). Snakes also have a larger range of 62cm across five publications (Table 5 ). Salamanders and newts have the lowest range of a 20cm difference in recommended height across the five guidelines that have specifications for this genus (Table 5 ).
These publications span 22 years and across this timeframe the minimum height suggested for each genus has remained similar between the relevant guidelines with the exception of snakes (Figure 2 ). Between 2015 and 2021 the recommended fence height to target snakes rose from 110cm to 200cm in 2016 and then back down again. This trend can also be seen with the fencing recommendations for reptiles and amphibians who have been grouped together in four publications, rising from 40cm in 2012 to 80cm in 2016 before reducing back to 40cm in 2022 (Figure 2) .
Table 5. The minimum and maximum fencing heights suggested across published guidelines that provide recommendations for each genus and the difference between these heights (cm).