Table 1. Details of specimens examined in this project, including CT scan information.

Species	Spec. No.	Age, days	Litter	Body mass, g	Sex	Scan made	Scanned	Voxel side length, μm
Heterocephalus glaber	CU1	1166	B1	44.5	M	Cambridge	Bulla	5.4
	CU2	1316	A1	54.5	M	-	-	-
	CU3	1358	A1	63.5	M	Cambridge	Head	17.8
	CU4	1	C3	1.8	F	Cambridge	Head	7.5
	CU5	1656	A1	43.5	M	Cambridge	Head	15.7
							Bulla	6.9
	CU7	1753	A1	58.0	M	-	-	-
	CU8	37	D3	2.3	M	Cambridge	Head	7.8
	CU9	37	D3	1.1	M	-	-	-
	CU10	2	E2	1.0	?	-	-	-
	CU15	204	D3	44.5	F	-	-	-
	CU16	212	D3	38.5	M	-	-	-
	CU17	194	D3	38.0	M	Cambridge	Bullae	6.0
	CU18	176	D3	36.0	F	Cambridge	Bulla	4.8
	CU19	1997	A1	81.5	M	Cambridge	Head	16.8
							Bulla	6.1
	CU20	118	F3	23.0	M	Cambridge	Head	13.6
							Bulla	4.9
	BZ3	?1	G	1.4	?	-	-	-
	BZ4	?1	G	1.1	M	-	-	-
	BZ5	?1	G	1.5	M	Cambridge	Head	7.6
Bathyergus suillus	178	?	N/A	?	?	Hull	Skull	48.4
	618	?	N/A	650	M	Hull	Skull	45.1
Cryptomys hottentotus	E3116	?	N/A	?	?	Cambridge	Skull	12.6
	E3118	?	N/A	?	?	Cambridge	Skull	13.3
	E3119	?	N/A	?	?	Cambridge	Skull	15.3
Fukomys micklemi	F1	?	N/A	?	F	Cambridge	Head	21.5
							Bulla	6.8
	F2	?	N/A	?	M	Cambridge	Head	22.5
Georychus capensis	E3110	?	N/A	?	?	Cambridge	Skull	21.2
Heliophobius argenteocinereus	Ha25	?	N/A	198	F	Hull	Skull	30.9
	Ha38	?	N/A	148	F	Hull	Skull	33.2

Heterocephalus ‘CU’ specimens were from the colony in the University of Cambridge while ‘BZ’ specimens came originally from Bristol Zoo. The litter lettering indicates which naked mole-rats were siblings. The associated number 1 refers to a member of the original Cambridge colony, 2 to an animal bred from the colony queen, and 3 to animals bred from a male and female which had been separated from the original colony. CT scans from the University of Hull were made by Dr. Phil Cox as part of a separate research project.