Figure 1. Counts of the most recommended materials to use for reptile and amphibian fencing across the twelve best practice guidelines

From 2015 onwards guidelines began suggesting opaque fencing (Table 4 ), with the exception of Caltrans recommending the use of woven polypropylene or polyethylene sheets for temporary projects, as well as the Western Institute for Transportation suggesting adaptations to chain-link and the Spanish Ministry of Agriculture, Food and the Environment suggesting standard mesh (2cm x 2cm) (Table 4 ). In the reviewed guidelines, conservation and non-governmental organisations often recommend opaque panels, whereas government departments often recommend thin plastic or mesh-based materials as well (Table 4 ).

Table 4. A summary of the recommended materials to use for reptile and amphibian fencing across the 22 year period that these best practice guidelines have been published in