Fig. 3
From: Effects of tag mass on the physiology and behaviour of common noctule bats
Flight metabolic power of six common noctule bats (n = 22 flight trails) flying in a wind tunnel at 8 m/s, either with or without a 3.8 g GPS tag. Metabolic costs of flight increased in six of 11 flight trials, compared to four where costs decreased and one where costs were similar