And in Ontario, Canada, wolves have depended on beavers when ungulates were scarce. 在加拿大的安大略省,当有蹄类动物的数量减少的时候,狼靠海狸为生。
Hoof, for thickening of the claws, especially ungulates developed, and continued proliferation, to compensate for wear parts. 蹄,为增厚的爪,有蹄类特别发达,并可不断增生,以补偿磨损部分。