Table 2.

Comparison of age of loci among diverse mammal genomes

Species	Common name	Order	Number of young loci (0–6.6my) a	Number of old loci (6.6-31.6my) a	Ratio of young to old loci
Homo sapiens	Human	Primates - Hominoidea	66	2468	0.027
Pan troglodytes	Chimpanzee	Primates- Hominoidea	152	1745	0.087
Gorilla gorilla	Western gorilla	Primates- Hominoidea	138	1345	0.103
Pongo pygmaeus	Bornean orangutan	Primates- Hominoidea	723	1857	0.389
Nomascus leucogenys	White-cheeked crested gibbon	Primates - Hominoidea	1113	6083	0.183
Macaca mulatta	Rhesus macaque	Primates - Cercopithecidae	187	1531	0.122
Papio hamadryas	Hamadryas baboon	Primates- Cercopithecidae	241	1266	0.190
Callithrix jacchus	Common marmoset	Primates - New World Monkeys	136	605	0.225
Tarsius syrichta	Philippine tarsier	Primates - tarsiers	1845	1195	1.544
Microcebus murinus	Gray mouse lemur	Primates - lemurs	751	398	1.887
Otolemur garnettii	Northern greater galago	Primates - lorises	255	412	0.619
Echinops telfairi	Small Madagascar hedgehog tenrec	Afrotheria	185	786	0.235
Bos taurus	Domestic cow	Artiodactyla	182	793	0.230
Sus scrofa	Domestic pig	Artiodactyla	19	59	0.322
Vicugna pacos	Alpaca	Artiodactyla	176	96	1.833
Ailuropoda melanoleuca	Giant Panda	Carnivora	56	80	0.700
Canis familiaris	Domestic dog	Carnivora	26	119	0.218
Felis catus	Domestic cat	Carnivora	167	204	0.819
Tursiops truncatus	Bottlenose dolphin	Cetacea	20	192	0.104
Myotis lucifugus	Little brown bat	Chiroptera	308	308	1000
Pteropus vampyrus	Large flying fox	Chiroptera	106	187	0.567
Erinaceus europaeus	West European hedgehog	Erinaceomorpha	1667	1268	1.315
Procavia capensis	Cape hyrax	Hyracoidea	1164	870	1.338
Ochotona princeps	American pika	Lagomorpha	309	277	1.116
Oryctolagus cuniculus	European rabbit	Lagomorpha	316	268	1.179
Macropus eugenii	Tammar wallaby	Marsupialia	54	491	0.110
Monodelphis domestica	Gray short-tailed opposum	Marsupialia	1162	4344	0.267
Ornithorhynchus anatinus	Duck-billed platypus	Monotremata	163	94	1.734
Equus caballus	Horse	Perissodactyla	22	159	0.138
Choloepus hoffmanni	Hoffmanns two-toed sloth	Pilosa	711	1425	0.499
Loxodonta africana	African bush elephant	Proboscidea	416	1411	0.295
Cavia porcellus	Guinea pig	Rodentia	1608	1450	1.109
Dipodomys ordii	Ord's kangaroo rat	Rodentia	273	223	1.224
Mus musculus	House Mouse	Rodentia	3045	1402	2.172
Rattus norvegicus	Brown rat	Rodentia	737	897	0.822
Spermophilus tridecemlineatus	Thirteen-lined ground squirrel	Rodentia	1271	726	1.751
Tupaia belangeri	Northern treeshrew	Scandentia	295	315	0.937
Sorex araneus	Common shrew	Soricomorpha	502	395	1.271
Dasypus novemcinctus	Nine-banded armadillo	Xenarthra	1631	3240	0.503

^aAge of locus is estimated using our nearest-neighbor method with a substitution rate of 2.2×10⁹ substitutions per nucleotide per year and a Jukes-Cantor correction for multiple hits.