I’m not sure about herons in particular, but that’s a common shape for the tongues of other birds as banders will attest (the raised bit at the back can get snagged in the mist net).
Alison
From: Martin Butterfield <>
Sent: Monday, 25 March 2019 8:19 PM
To: COG List <>
Subject: [canberrabirds] A heron's tongue
Walking around Lake Conjola in Eden today I passed a White-faced Heron with its bill open giving a food view of what I assume to be its tongue visible.
Is that the normal appearance for a heron's tongue?