Petra Wegner / Cavalier King Charles Spaniel, tricolour, getting teeth brushed with oral cleaner, model released

Juergen Freund / Bornean Orangutan (Pongo pygmaeus wurmbii) 'Siswi' yawning whilst brushing her teeth, a behaviour she mimics from humans, Camp Leakey, Tanjung Puting National Park, Borneo, Central Kalimantan, Indones...

Juergen Freund / Bornean Orangutan (Pongo pygmaeus wurmbii) 'Siswi' brushes her teeth, a behaviour she mimics from humans, Camp Leakey, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male licking female genitalia, followed by mating and male genital cleaning, Yarra Bend Park, Fairfield, Victoria, Australia, April.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male licking female genitalia, Yarra Bend Park, Fairfield, Victoria, Australia, April.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male licking female genitalia, then cleaning his genitals, Yarra Bend Park, Fairfield, Victoria, Australia, April.

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male involved in courtship / mating behaviour including licking female's genitalia; male grooming his own penis, bickering and female climbing away, Yar...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male courtship / mating behaviour with female including licking her genitalia, then bickering, before male grooms his own penis, Yarra Bend Park, Victor...