Small to medium-sized rodents with long tails, pointed snouts, and prominent teeth. Often considered pests but also used in scientific research.
From Old English ræt, of uncertain origin, possibly from Proto-Germanic rattaz. May be related to the gnawing sound they make or their habit of 'rooting' around.
Rats are incredibly empathetic animals - they'll free trapped companions even when offered chocolate as an alternative reward. They also laugh when tickled, producing ultrasonic giggles that humans need special equipment to hear.
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