Which animal has never seen its mother?

Labord's chameleon. One lizard species goes a step further—not only do the young never see their parents, they never see any adults of their species at all.

nationalgeographic.com - Go, Baby! These Animal Babies Grow Up Without Any Help From Parents

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We all need a push once in a while—but hopefully it’s not a literal one. WAQ reader Hannah wrote in asking, “Do mother birds push their babies out of the nest?” Daniel Roby, an ornithologist at Oregon State University, says he’s never seen such behavior or documentation of it, though in some bird species, “parents call to their young in the nest to coax them into leaving when it’s time to do so.”

Hannah’s question made us wonder: What brave offspring do get pushed out into the world before they feel they're ready?

Megapodes

Most birds receive parental care (March of the Penguins, anyone?), but megapodes—a group of chicken-like birds native to eastern Australia, New Guinea, Indonesia, and the Philippines—are a big exception. These birds “do not even directly incubate their eggs,” Roby says. Instead “they build a large mound of decaying vegetation and lay their eggs in the mound.” According to The Handbook of Bird Biology, the mounds can be “the size of a car.” The parents do control the mound’s temperature “by removing or adding more vegetation,” says Roby, but once the offspring are born, they dig their way out of the mound and “run off into the brush without ever seeing their parents.”

The chicks can fly within 24 hours.

“Mother crocodiles give their young more post-hatching care than megapodes do,” Roby notes. Indeed, baby crocs are among the very few reptiles that receive parental care, including being carried around in mom’s gigantic mouth. (See video: World’s Deadliest: Killer Croc Carries Babies in Jaws)

Western Fence Lizards

Most lizards, on the other hand, “deposit their eggs, cover them, immediately forget they did that and move along,” says Nassima Bouzid, a PhD candidate at the University of Washington.

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Because they have a cloaca, an opening for their reproductive, digestive, and urinary systems, Bouzid says, lizards like the western fence lizards of Yosemite—which she studies—may just think the eggs are “an uncomfortable and weird poop,” and never think about it again. Bouzid says the lack of parental care in most lizards may simply be part of a strategy to have as many offspring as possible in hopes that some will survive.

Labord’s chameleon

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One lizard species goes a step further—not only do the young never see their parents, they never see any adults of their species at all. At least one population of The Labord’s chameleon of southwest Madagascar’s dry forests “will lay all of their eggs before winter. The eggs will then hatch just before the summer rains,” says Bouzid. The eggs spend eight to nine months developing and in the meantime, the adults will have aged and died.

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The newly orphaned offspring “will grow where there are absolutely no adults of their species,” says Bouzid. “You can imagine if they don’t get a chance to reproduce, the whole population is gone,” Bouzid says of the species, whose forest habitat is threatened by environmental changes.

Butterflies and moths

Many insects receive parental care, but not moths and butterflies. They lay their eggs on host plants and leave their offspring to fend for themselves. “Some lay their eggs near ant nests and the ants take care of the caterpillars. “It’s like Moses in miniature,” says Katy Prudic, an entomologist at the University of Arizona. The caterpillar of the large blue butterfly, for example, secretes a sweet substance attractive to a particular species of red ant and makes itself smell like an ant larvae so the ant takes it back to its nest with its own brood, which the caterpillar then eats. Some young are protected from predators via toxic chemicals from their host plant—and others have pitch-perfect camouflage. The common lytrosis of eastern North America, for example, is perfectly disguised as a twig. And if it happens to fall off its background branch, it can use its silk to attach a “life line” and pull back up. (Related: Toxic Toupee: Explaining the most Venomous Caterpillar in the U.S.)

Talk about a sticky situation.

Have a question about the weird and wild world? Tweet me or find me on Facebook. Weird Animal Question of the Week answers your questions every Saturday.

nationalgeographic.com - Go, Baby! These Animal Babies Grow Up Without Any Help From Parents

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