| Lith. | klykti | to call loud |
| Lith. | klykys et var. | Black Kite, 215 |
| Lith. | klykuolé | Goldeneye, 54 |
| Lith. | klykis | Buzzard, 211; Curlew, 167; also attributed to an owl |
| Lettish | kliukstinSet var. | White Stork, 127 |
| Sbc. | kliktati, kleketuoti | to call (birds of prey) |
| Sbc. | klikavac et var. | Kestrel, 234 |
| Sbc. | kliktanje | call of the falcon |
| Sbc. | klikotati | to sing (Capercaillie, 7) |
| Sbc. | klek, klikovac | Nightjar, 251 |
| Pol. | klekotka | Gadwall, 45; White Stork, 127 |
| Lith. | klekinti | to clatter (White Stork, 127) |
| Russian | klik | cry, call |
| Russian | klikun | Whooper Swan, 26 |
| Engl. | click | French déclic |
| Germ.reg. | lysklicker | Common Sandpiper, 178 |
| Germ.reg. | zäklecker | Wren, 406 |
| Germ.reg. | zäkliegerche | Wren, 406 |
| Gael.S. | clisgein | Black Swift, 321 |
| Gael.I. | gligín, gliog | to tinkle |
| Franç.: Verviers | glèketer | faire aller le battant d'une cloche... FEW 23: 159 |
| Alb. | gjekëtin | he makes noise, cf. gjepura, hereunder |
| Franç. | cliquetis | clicking |
| Lith. | klegéti | to clatter; Lettish kladzèt id. |
| Lith. | klegetis | White Stork, 127 |
| Lettish | kluga et var. | White Stork, 127 |
| Lith. | kliegti | to call loud |
| Lettish | kliegt | to cry |
| Russian | klegtat' | to cry (Buzzard, 211) |
| Bielor. | klygun | Herring Gull, 81 |
| Anc.Greek | klokmós | cackling (hens) |
| Germ. | klagen | to cry, moan |
| Germ.reg. | klageule | Tawny Owl, 239 |
| Germ. | klang | sound |
| Germ. | klingen | to cry (Buzzard, 211) |
| Germ.reg. | klinger, klangente | Goldeneye, 54 |
| Anc.Greek | klangè | shrill cry |
| Anc.Greek | klangos, plangos | a hawk, prob. the Buzzard, 211 |
| Lat. | clangor | (borr. from Greek) "cry of the eagle" = of the Buzzard, 211 |
| Engl.: Scot. | pleengie | young gull, 81 |
| Roman. | plînge | to cry |
| Ital. | piangere | id. |
| Ital.reg. | piangin | Lapwing, 158; Nuthatch, 401 |
| Ital.: Ver. | pianzer | to chirp |
| Basque | klixket, klasketa | castanets |
| Roman. | clinchet | to click |
| Roman. | clince | Chiffchaff, 385 |
| Alb. | kllinzë | Golden Plover, 161 |
| Roman. | clantâ | lock; Magpie, 288 |
| Roman. | clantâni | to creak, strike, etc. |
| Roman. | cloncâni | to clatter (White Stork, 127); to crow (Raven, 283) |
| Roman. | cloncât | to creak |
| Roman. | cloncuitoare | Buzzard, 211 |
| Russian | kloktunja | Baikal Teal, 44a |
| Russian | klokot | Barnacle Goose, 32 |
| Russian | klokySa | domestic duck, 40 |
| Lith. | klokuSa | domestic duck, 40 |
| Ukr. | kljakodrov | Green Woodpecker, 270 |
| Sbc. | klukavac | Green Woodpecker, 270 |
| Sbc. | kljucavac | Green Woodpecker, 270 |
| Sbc. | klucati | to hit, cut etc. |
| Sbc. | klocati, Sklocnuti | to sing (Capercaillie, 7) |
| Breton | sklokal | to cackle |
| Dan. | kluk mæge | Herring Gull, 81 |
| Mod.Greek: Chypre | klókoros | Raven, 283 |
| Anc.Greek | klázo | to boo |
| Anc.Greek | klozo | to shriek, to cackle |
| Mod.Greek | klóxaro | to sob |
| Mod.Greek | kloxári, klosso | Tawny Owl, 239 |
| Anc.Greek | glaux | Tawny Owl, 239 |
| Ukr. | fl'oker | Nightjar, 251 |
| Ukr. | klokot, tlukot | song of the Nightingale, 337 |
| Alb. | kllok-i-më | clicking noise |
| Engl. | clock | watch (clicking mecanism) |
| Alb. | klloçit | to cackle |
| Breton | sklaukal | to cry, whine |
| Franç.: Namur | sclauchi | claquer (fouet) FEW 23: 204 |
| Franç.: Aoste | lliochá | se dit du bruit d'un liquide que l'on secoue FEW 23: 202 |
| Icel. (o.liter.) | hlakka | to cry |
| Franç.rég. | claquart | Rock Pigeon, 254 |
| Franç.: Liège | claquer | to cry (Buzzard, 211) |
| Franç.rég. | claque et var. | Fieldfare, 341; slap |
| Franç.rég. | clatche | slap |
| Engl. | clash | to make a loud, harsh noise (not a hybrid clash and dash) |
| Franç. | claquer | to slam, bang |
| Engl.: Scot. | claik | raucous bird cry; gossip, chatter |
| Engl.reg. | clakis, claik-goose | Brent Goose, 32 |
| Germ. | nachklatsche | Nightjar, 251 |
| Germ.reg. | klatschmärkel | Jay, 290 |
| Engl.: Scot. | clytach | senseless chatter |
| Engl. | clatter | to make a loud rattling sound; Dutch klateren to rattle |
| Engl.reg. | clatter-goose | Brent Goose, 32 |
| Franç. | éclater | burst into pieces |
| Franç.: Alain | clantí | retentir, FEW 23: 201 |
| Prov. | esclandí | retentir, FEW 23: 201 |
| Prov.: B.du Rh. | resclantido | éclat du son, FEW 23: 201 |
| Franç.: H.Sav. | recliannâ | to sound |
| Franç.rég. | clette | Avocet, 157 (cf. clèpeð5.12.6.) |
| Sbc. | klatno | clapping |
| Lat. | glottorare | to clatter (White Stork, 127) |