| Species | Common name | #Introns | #exons | #genes | intron density (introns per gene) | Average length of introns | Average length of exons | Intron <250 nt | Intron <250 nt % | ||
| Vertebrate | Homo sapiens | Human | 200,220 | 222,620 | 22,400 | 8.94 | 5585 | 290 | 33,030 | 16.47% | |
| Gorilla gorilla | Gorilla | 175,706 | 196,668 | 20,962 | 8.38 | 4885 | 231 | 31,136 | 17.26% | ||
| Pongo abelii | Orangutan | 160,947 | 181,015 | 20,068 | 8.02 | 5128 | 184 | 25,953 | 14.79% | ||
| Nomascus leucogenys | Nomascus | 163,876 | 182,037 | 18,161 | 9.02 | 5311 | 227 | 26,556 | 15.64% | ||
| Macaca mulatta | Macaque | 170,349 | 192,254 | 21,905 | 7.78 | 5136 | 208 | 31,929 | 18.28% | ||
| Callithrix jacchus | Marmoset | 180,677 | 201,670 | 20,993 | 8.61 | 4887 | 209 | 33,461 | 17.71% | ||
| Otolemur garnettii | Bushbaby | 168,860 | 188,366 | 19,506 | 8.66 | 4013 | 174 | 30,947 | 18.14% | ||
| Mus musculus | Mouse | 185,124 | 208,207 | 23,083 | 8.02 | 4730 | 292 | 30,364 | 16.36% | ||
| Rattus norvegicus | Rat | 175,836 | 198,774 | 22,938 | 7.67 | 4119 | 215 | 33,817 | 18.81% | ||
| Cavia porcellus | Guinea pig | 165,277 | 183,950 | 18,673 | 8.85 | 3485 | 159 | 35,816 | 21.33% | ||
| Spermophilus tridecemlineatus | Ground squirrel | 162,616 | 181,442 | 18,826 | 8.64 | 3878 | 191 | 30,650 | 18.70% | ||
| Oryctolagus cuniculus | Rabbit | 158,571 | 177,589 | 19,018 | 8.34 | 4181 | 167 | 30,617 | 18.92% | ||
| Bos taurus | Cow | 176,751 | 196,745 | 19,994 | 8.84 | 4123 | 206 | 31,586 | 17.72% | ||
| Sus scrofa | Pig | 165,457 | 187,097 | 21,640 | 7.65 | 3741 | 235 | 31,497 | 18.85% | ||
| Equus caballus | Horse | 168,906 | 189,342 | 20,436 | 8.27 | 4071 | 179 | 30,133 | 17.36% | ||
| Ailuropoda melanoleuca | Panda | 167,266 | 186,609 | 19,343 | 8.65 | 3792 | 163 | 31,294 | 18.37% | ||
| Canis familiaris | Dog | 172,649 | 191,954 | 19,305 | 8.94 | 3355 | 166 | 34,090 | 19.50% | ||
| Myotis lucifugus | Little brown bat | 162,402 | 182,130 | 19,728 | 8.23 | 2849 | 166 | 30,744 | 18.50% | ||
| Loxodonta africana | Elephant | 164,413 | 184,446 | 20,033 | 8.21 | 4201 | 164 | 30,850 | 18.36% | ||
| Monodelphis domestica | Opossum | 154,585 | 174,051 | 19,466 | 7.94 | 5861 | 175 | 22,474 | 14.35% | ||
| Sarcophilus harrisii | Tasmanian devil | 159,994 | 178,782 | 18,788 | 8.52 | 4012 | 214 | 25,238 | 15.73% | ||
| Ornithorhynchus anatinus | Platypus | 131,940 | 149,891 | 17,951 | 7.35 | 2529 | 151 | 23,841 | 17.78% | ||
| Taeniopygia guttata | Zebra finch | 138,730 | 156,218 | 17,488 | 7.93 | 2578 | 158 | 26,920 | 19.03% | ||
| Meleagris gallopavo | Chicken | 138,359 | 152,484 | 14,125 | 9.80 | 2094 | 159 | 29,629 | 21.21% | ||
| Anolis carolinensis | Anole lizard | 151,656 | 169,461 | 17,805 | 8.52 | 2565 | 160 | 22,432 | 14.71% | ||
| Xenopus tropicalis | Xenopus | 176,136 | 194,565 | 18,429 | 9.56 | 2126 | 183 | 38,021 | 21.51% | ||
| Danio rerio | Zebrafish | 222,613 | 248,825 | 26,212 | 8.49 | 2820 | 232 | 71,740 | 32.17% | ||
| Gasterosteus aculeatus | Stickleback | 198,562 | 219,349 | 20,787 | 9.55 | 760 | 161 | 105,506 | 52.85% | ||
| Oryzias latipes | Medaka | 184,785 | 204,471 | 19,686 | 9.39 | 1184 | 154 | 91,874 | 49.53% | ||
| Takifugu rubripes | Fugu | 186,915 | 205,438 | 18,523 | 10.09 | 577 | 154 | 118,078 | 62.82% | ||
| Tetraodon nigroviridis | Tetraodon | 184,204 | 203,806 | 19,602 | 9.40 | 481 | 150 | 125,982 | 67.06% | ||
| Petromyzon marinus | Sea lamprey | 80,747 | 91,149 | 10,402 | 7.76 | 1471 | 141 | 13,360 | 16.47% | ||
| Invertebrate | Acyrthosiphon pisum | Pea aphid | 112,323 | 146,924 | 34,601 | 3.25 | 1180 | 241 | 61,021 | 54.33% | |
| Aedes aegypti | Mosquito | 46,641 | 62,639 | 15,998 | 2.92 | 4660 | 412 | 25,538 | 54.75% | ||
| Apis mellifera | Western honey bee | 58,020 | 68,714 | 10,694 | 5.43 | 1269 | 253 | 38,854 | 66.97% | ||
| Atta cephalotes | Leafcutter ant | 65,592 | 83,654 | 18,062 | 3.63 | 610 | 233 | 35,938 | 54.79% | ||
| Danaus plexippus | Monarch butterfly | 79,459 | 95,713 | 16,254 | 4.89 | 763 | 211 | 36,213 | 45.57% | ||
| Caenorhabditis elegans | Nematode | 106,539 | 127,056 | 20,517 | 5.19 | 306 | 223 | 75,075 | 70.47% | ||
| Drosophila melanogaster | Fruitfly | 45,188 | 59,105 | 13,917 | 3.25 | 1117 | 494 | 32,052 | 70.93% | ||
| Pediculus humanus | Lice | 58,509 | 69,280 | 10,773 | 5.43 | 294 | 240 | 48,108 | 82.22% | ||
| Strongylocentrotus purpuratus | Sea urchin | 155,000 | 185,152 | 28,525 | 5.43 | 1668 | 266 | 7848 | 5.06% | ||
| Trichoplax adhaerens | Trichoplax | 85,517 | 97,037 | 11,520 | 7.42 | 284 | 163 | 63,563 | 74.33% | ||
| Ciona savignyi | Sea squirt | 74,286 | 85,890 | 11,604 | 6.40 | 667 | 171 | 17,736 | 23.88% | ||
| Ciona intestinalis | Sea squirt | 98,014 | 114,685 | 16,671 | 5.88 | 479 | 178 | 34,046 | 34.74% |