Male marmosets take care of their offspring as newborns — even licking and grooming them at birth. If that isn't sweet enough, consider this: After his babies are born, a marmoset daddy doesn't look twice at an ovulating female, despite stereotypes that male animals are always out to spread their genes.
Gestating and giving birth is an energy-sapping process for mama marmosets, so dad's involvement is crucial to the offspring's survival. When researchers at the National Primate Research Center wafted the scent of a sexually available female toward daddy marmosets, they expected that the animals' testosterone levels would spike, indicating sexual arousal. Instead, the marmosets proved themselves to be serious family guys. Their testosterone levels didn't even waver, the researchers reported in 2005 in the journal Hormones and Behavior.
Need a lift? Some froglets have it made in that arena. Members of the family Microhylidae, which includes pointy-headed frogs, the males of two frog species were found to transport their froglets piggyback style. The species, Sphenophryne cornuta and Liophryne schlaginhaufeni (shown here), live in the mountains of Papua New Guinea, where David Bickford of the National University of Singapore discovered this froggy-father transport.
"As the offspring jump off at different points, they may benefit from reduced competition for food, lower predation pressure and fewer opportunities for inbreeding between froglets, which may explain why this unusual form of parental care evolved," Bickford wrote in 2002 in the journal Nature. For these species, once mom has layed her eggs, she's gone, leaving dads to fertilize and care for the developing young.
Spotted sandpiper ladies, it seems, get to have all the fun, at the expense of Dad. In this polyandrous species (Actitis macularius), the female is much larger than the male and mates with several males. She stakes out her bachelorette pad where she lures in a mate. The real kicker? After laying her four eggs in a ground nest, she flits off to find another guy pal, leaving the male sandpiper to incubate the eggs and then tend to the young for at least four weeks. Go papa sandpiper!
Penguin dads are extremely hands-on (or should that be 'wings-on?' in caring for their chicks. Male penguins take egg-sitting duties for weeks while mom heads to sea to hunt fish for her soon-to-hatch offspring. Males fast during this time period, but if the chick hatches before mama penguin returns, dad can still produce a curd-like substance, which he regurgitates to keep baby fed.
In fact, males are so important to the brooding process that females seek out pudgy partners who can sit on eggs longer without food. One 2010 study found that females can tell how fat a male penguin is by listening to his hoarse mating cries.
Emus (Dromaius novaehollandiae) make for sturdy parents, with adults towering at about 6.5 feet (2 meters) and weighing up to 100 pounds (45 kilograms), according to the Australia Zoo. And papa emus can't be beat. After mama lays her clutch of some six to 11 eggs, she wanders off to find another mate while he watches over the incubating eggs for about 60 days. And then, as a single parent, the male cares for his emu chicks for up to two years.
This father fox takes on babysitting responsibilities while the mother is off foraging. In fact, the males of bat-eared foxes (Otocyon megalotis) spend as much if not more time guarding, grooming and rearing the young as the females. This nocturnal species lives in family groups with a monogamous mating pair and their young.