An axolotl ranges in length from 15 to 45 cm (6 to 18 in), although a size close to 23 cm (9 in) is most common and greater than 30 cm (12 in) is rare. This little guys are basically aquatic salamanders as they posses alot of the same features. They have 28 chromosomes in pairs of 14, each gender has the same amount.
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A zebra fish is a freshwater fish belonging to the minnow family, The zebrafish can reach up to 4–5 cm (1.6–2.0 in) in length, the average lenghth is 1.8–3.7 cm (0.7–1.5 in). A Zebrafish also has 25 chromosomes, only 2 more than humans.
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The walking catfish is greyish brown with white spots and has an elongated body shape and reaches almost 0.5 m (1.6 ft) in length and 1.2 kg (2.6 lb) in weight. This fish has 27 chromosome pairs with no distinct sex chromosomes, they can also breathe air due to tree-like structures located just above the gills. When the fish opens its mouth in the air, throat muscles cause the gills to close and the passage to the tree-like organ to open.
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