1. Tread-water feeding of Bryde’s whales
Takashi Iwata, Tomonari Akamatsu, Surasak Thongsukdee, Phaothep Cherdsukjai, Kanjana Adulyanukosol, Katsufumi Sato 
Current Biology 
Volume 27, Issue 21, Pages R1154-R1155 (November 2017)
DOI: /j.cub
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2. Figure 1
Feeding behavior of Bryde’s whales (B. edeni) in the upper Gulf of Thailand.
The photographs (A–F) show an adult (left) and a calf (right). (A) The adult lifts its head above the water with a closed mouth. (B,C) The mouth is opened and the lower jaw is dropped onto the sea surface. (D) The whale holds its position and makes a channel for prey at the corners of the mouth. (E) The mouth is closed and the whale dives. (F) Higher-magnification view of the stage shown in (D) from a different angle and with a different animal. The red circle shows the channel in the corner of the mouth. (G) Body movement during surface feeding. Top panel: cartoon showing whale’s behavior. Second panel: depth. The data logger was positioned approximately 1 meter behind the dorsal fin. Third panel: swimming speed. Swimming speeds slower than the stall speed of 0.2 m s-1 are not shown. Fourth panel: longitudinal dynamic acceleration along the body axis, which indicates the stroking movement. Bottom panel: behavioral spectra of longitudinal acceleration. The whale apparently lifted its head almost completely out of the water to feed. The acceleration signals of short (approximately 0.7 seconds) cycles were recorded when the whale lifted its head.
Current Biology  , R1154-R1155DOI: ( /j.cub )
Copyright © 2017 Elsevier Ltd Terms and Conditions