Original: It has been proposed that this tail was used as a stabilizer and\/or counterweight while running or in the air ; in Microraptor , an elongate diamond-shaped fan of feathers is preserved on the end of the tail .
Simplified: It has been proposed that this tail was used as a stabilizer and\/or counterweight while running . In Microraptor , an elongate diamond-shaped fan of feathers is preserved on the end of the tail .