Baby humpback whales seem to whisper to their mothers, according to scientists who have captured the infant whales' quiet grunts and squeaks.
The recordings, described in the journal Functional Ecology [wiley.com], are the first ever made with devices attached directly to the calves.
High suckling rates and acoustic crypsis of humpback whale neonates maximise potential for mother–calf energy transfer [wiley.com] (open, DOI: 10.1111/1365-2435.12871) (DX [doi.org])