Squirrels yog haiv neeg rau Asmeskas, Eurasia, thiab Africa, thiab tau qhia los ntawm tib neeg rau Australia. Cov squirrels paub ntxov tshaj plaws hnub los ntawm Eocene epoch, thiab ntawm lwm cov tsev neeg nas nyob, cov squirrels muaj feem cuam tshuam nrog roob beaver thiab dormice.
Thaum twg squirrels thawj zaug tshwm sim hauv ntiaj teb?
Cov pov thawj pob txha ntxov tshaj plaws rau squirrels tau pom nyob rau sab hnub poob North America thiab hnub tim rau kwv yees li 36 lab xyoo dhau los, tus sau sau.
squirrel tuaj America li cas?
"Los ntawm nruab nrab-19th caug xyoo, squirrels tau raug tshem tawm ntawm lub nroog," nws hais. … Hauv kev tshawb nrhiav keeb kwm ntawm squirrels hauv Asmeskas cov nroog, Benson pom qhov thawj cov ntaub ntawv qhia tau tshwm sim hauv Philadelphia's Franklin Square xyoo 1847Lwm qhov kev taw qhia ua raws hauv Boston thiab New Haven hauv 1850s.
squirrels poj koob yawm txwv yog dab tsi?
Cov poj koob yawm txwv ntawm squirrels thiab roob beaver yog lub npe hu ua ischyromyids35 Lawv muaj ntau haiv neeg thaum ntxov Eocene tsev cog khoom huab cua (ca. 56–48 lab xyoo dhau los) thiab tej zaum yuav muaj fossorial rau scansorial36 , 37, tab sis tom qab ntawd poob thiab ploj mus thaum kawg ntawm Oligocene (23 lab xyoo dhau los)38
Dab tsi yog qhov hloov pauv ntawm squirrel?
Fossils sau keeb kwm kev hloov pauv ntawm tsob ntoo squirrels rov qab mus rau Lub Sij Hawm Eocene Epoch (41.3 lab rau 33.7 lab xyoo dhau los) hauv North America thiab Miocene Epoch (23.8 lab txog 5.3 lab xyoo dhau los) lab xyoo dhau los) hauv Africa thiab Eurasia. 2 subfamilies suav nrog 272 hom hauv 51 genera pom thoob ntiaj teb.
