Mark Raycroft / Jack Russell or Parson Terrier (Canis familiaris) adult jumping through agility tire

Shibai Xiao / Tire track eel (Mastacembelus armatus) group within rainforest ecosystem, Yinggeling National Nature Reserve, Hainan Island, China.

Shibai Xiao / Tire track eel (Mastacembelus armatus) in rainforest ecosystem, Yinggeling National Nature Reserve, Hainan Island, China.

Shibai Xiao / Tire track eel (Mastacembelus armatus) two photographed on white background in rainforest ecosystem, Yinggeling National Nature Reserve, Hainan Island, China.

Pete Oxford / Dunes of Erg Chebbi near the village of Merzouga with vehicle tire marks, Morocco

Stephen Belcher / Christmas Island Red Crab (Gecarcoidea natalis) crushed by car while trying to cross road, Christmas Island, Australia

Colin Monteath / Abandoned car tires in junkyard, Christchurch, New Zealand

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) cub playing in tire swing, Wolong Nature Reserve, China

Tony Brunt / Kea (Nestor notabilis) picking at a tire, Arthurs Pass National Park, New Zealand

Pete Oxford / Hanuman Langur (Semnopithecus entellus) sitting on spare tire of tourist vehicle, Ranthambhore National Park, Rajasthan, India

Mark Raycroft / English Springer Spaniel (Canis familiaris) jumping through agility tire

Mark Raycroft / Australian Shepherd (Canis familiaris) jumping through tire

Suzi Eszterhas / Orangutan (Pongo pygmaeus) juvenile in play area, Orangutan Care Center, Borneo, Indonesia