Unfortunately, it's behind a paywall, but it's here: http://dx.doi.org/10.1111/jfb.13789 If you want a copy, try emailing Mark Westneat listed in the above URL.
However, here's a useful figure on which species burrow: https://twitter.com/mwestneat/status/1037394353357049859
cheers,
-joe
However, here's a useful figure on which species burrow: https://twitter.com/mwestneat/status/1037394353357049859
cheers,
-joe



