Blue-eared Kingfisher
Alcedo meninting
This 16 centimetres (6.3 in) long kingfisher is almost identical to the common kingfisher (Alcedo atthis) but is distinguished by the blue ear coverts, darker and more intense cobalt-blue upperparts with richer rufous under parts. The juvenile blue-eared kingfisher has rufous ear-coverts as in the common kingfisher but it usually shows some mottling on the throat and upper breast which disappears when the bird reaches adulthood. Young birds have a reddish bill with whitish tips.
ID text from Wikipedia, CC BY-SA 4.0
Common Kingfisher
Alcedo atthis
This species has the typical short-tailed, dumpy-bodied, large-headed, and long-billed kingfisher shape. The adult male of the western European subspecies, A. a. ispida has green-blue upperparts with pale azure-blue back and rump, a rufous patch by the bill base, and a rufous ear-patch. It has a green-blue neck stripe, white neck blaze and throat, rufous underparts, and a black bill with some red at the base. The legs and feet are bright red. It is about 16 cm (6+1⁄2 in) long with a wingspan of 25 cm (10 in), and weighs 34–46 g (1+3⁄16–1+5⁄8 oz).
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Blue-eared Kingfisher and Common Kingfisher.