Most Eukaryotic Species Have an Even Number of Chromosomes.
Chromosomes exist in homologous pairs in diploid organisms, meaning the total count is typically an even number. Humans, for example, have 46 chromosomes (23 pairs).
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Some Female Snakes Can Reproduce Without a Male Through Parthenogenesis
Several snake species including boa constrictors and copperheads are capable of facultative parthenogenesis — producing offspring without fertilization. Female snakes can do this when isolated, essentially cloning themselves, though offspring have reduced genetic diversity.
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Rattlesnake Rattles Are Made of Interlocking Hollow Keratin Rings
Each time a rattlesnake sheds its skin, a new hollow keratin segment is added to the rattle. The segments interlock but are not attached, so they knock together to produce the distinctive sound. A new snake grows one segment per shed.
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The Smallest Snake in the World Is Shorter Than a Pencil
Tetracheilostoma carlae, the Barbados threadsnake, is the world's smallest known snake at just 10 cm long and as thin as a strand of spaghetti. It was only discovered in 2008 and feeds exclusively on termite and ant larvae.
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The Boomslang's Venom Dissolves Its Victim From the Inside
The boomslang of sub-Saharan Africa has hemotoxic venom that destroys red blood cells and prevents clotting, causing victims to bleed from every orifice. Symptoms may not appear for 24 hours, delaying treatment and making it uniquely dangerous.