Swift Tern vs Sandwich Tern
Nrog rau tib genus, ob qho tib si noog, swift tern thiab sandwich tern, nthuav tawm ntau yam ntawm cov yam ntxwv ntawm lawv. Txawm li cas los xij, qhov sib txawv ntawm ob lub terns no yuav nthuav kom paub. Cov yam ntxwv sab nrauv nrog lawv cov xim sib txawv yog qhov tseem ceeb rau kev pom hauv qhov txawv ntawm qhov nrawm nrawm ntawm cov qhaub cij terns raws li tau tham hauv kab lus no.
Swift Tern
Swift tern, Thalasseus bergii, aka great crested tern (Tsev neeg: Sternidae), nyob ib ncig ntawm cov ntug hiav txwv dej sov thiab cov Islands tuaj ntawm thaj chaw kub thiab kub ntawm Indian thiab Pacific Oceans. Muaj tsib subspecies ntawm swift terns, sib txawv raws li thaj chaw thaj chaw. Swift tern yog ib tug loj thiab stocky tern nrog lub cev ntev ntawm 48 centimeters thiab lub cev hnyav yuav luag 400 grams. Nws muaj ib tug shaggy dub crest thiab ib tug ntev me ntsis down-curved yellow xim daim nqi. Sab saum toj ntawm lawv lub cev yog dawb grey nyob rau hauv cov neeg laus tab sis streaked nrog dawb xim plaub nyob rau hauv cov me nyuam yaus thiab thaum lub sij hawm tsis yog yug me nyuam. Ventral thiab undersides yog dawb tab sis me ntsis dub rau lub tswv yim ntawm underwings. Nws muaj ob txhais ceg dub thiab luv, thiab ob leeg txiv neej thiab poj niam zoo li plumage. Lawv nthuav tawm colonial zes ntawm cov xuab zeb lossis pob zeb lossis coral Islands tuaj ntawm qhov siab qis. Lawv yog omnivores thiab ntses hiav txwv yog lawv cov khoom tseem ceeb.
Sandwich Tern
Sandwich tern, Thalasseus sandvicensis, kuj yog ib tug tswv cuab ntawm tsev neeg sternidae. Muaj peb subspecies ntawm sandwich terns raws li thaj chaw haiv neeg. Lawv nyob hauv ntug dej hiav txwv nyob ib ncig ntawm Dej hiav txwv Atlantic feem ntau. Txawm li cas los xij, lawv tsiv mus rau thaj tsam sov ntawm South Asian, Persian, Mediterranean, thiab West African lub teb chaws thaum lub caij ntuj no. Nws yog ib tug me me hiav txwv noog nrog ib tug ntev ntawm ib ncig ntawm 42 cm. Sab saum toj ntawm lawv lub cev muaj xim daj ntseg daj thiab cov hauv qab yog xim dawb. Thaum lub sij hawm yug me nyuam, lawv hood yog dub kiag li, tab sis lub crest me me yeej ib txwm dub nyob rau hauv cov xim. Lawv daim nqi yog xim dub thiab lub ntsej muag nrog lub taub yog daj. Lawv loj hlob nyob rau hauv cov cheeb tsam uas tuab heev ntawm thaj av ib ncig ntawm cov pas dej tshiab nyob ze rau ntawm ntug dej hiav txwv. Thaum lub caij yug me nyuam, cov txiv neej mus nuv ntses thiab nqa khoom plig rau lawv cov poj niam.
Qhov txawv ntawm Swift Tern thiab Sandwich Tern yog dab tsi?
• Sab saum toj ntawm ob tus noog muaj plaub plaub, tab sis cov no tsaus nti hauv tern nrawm dua li hauv cov qhaub cij terns.
• Cov menyuam yaus muaj cov plaub hau grey nrog cov kab dawb hauv cov kab nrawm nrawm, thaum cov no muaj xim av nrog cov xim tsaus nti hauv cov qhaub cij terns.
• Bill yog daj nyob rau hauv swift tern thiab dub nrog ib tug daj taub nyob rau hauv qhaub cij tern.
• Thaum lub caij ntuj no, lub hauv pliaj dawb yog qhov tseem ceeb hauv cov neeg laus ntawm cov qhaub cij piv rau cov terns nrawm.
• Shaggy black crest yog qhov tseem ceeb hauv kev nrawm nrawm, thiab tsis tshua muaj nyob hauv cov qhaub cij tern.
• Muaj tsib thaj chaw subspecies hauv swift tern, hos tsuas muaj peb ntawm lawv nyob rau hauv sandwich tern.
• Swift terns tsiv mus rau ntug dej hiav txwv ntawm Western Africa, South Asia, Persia, Mediterranean, thiab sov Americas nyob rau lub caij ntuj no. Txawm li cas los xij, qhaub cij terns nyob ib ncig ntawm ntug dej hiav txwv ntawm Indian thiab Pacific Oceans.
