With spring in the air, old animals reemerge while new animals like color-changing frogs, amphibious insects, big-toothed leeches and more make grand entrances.

For giggling hyenas, growling dogs, squeaking catfish, singing woolly bats and beeping honeybees, certain sounds are rich in complex communication and meaning.

Bomb-sniffing dogs aren't the only animal detectives, with cats and wasps having a surprising influence in the world of crime solving and law enforcement.

In honor of NCAA Tournament Selection Sunday, WebEcoist provides a Sweet Sixteen of the most recent bizarre, intriguing and exciting animal discoveries.

Animal suicide is seemingly easy to dismiss on the surface but merits more thought when considering how captivity, depression and other factors can affect animals.

Male pregnancy is a rare but real phenomenon in the animal kingdom, as evident in male frogs, bass, seahorses, pipefish and leafy dragon fish.

This week's tragic killer whale attack at SeaWorld has stirred controversy about the orca in question, Tilikum, and whether these dolphins should be captive.

Researchers have recently discovered some interesting mating behaviors by fruit flies, fruit bats, cane toads, beetles and a group of birds called great tits.

The dreaded, invasive Asian carp could be entering the Great Lakes, posing a serious threat to not only the ecosystem but fishermen on boats.

Just as Peyton Manning and Drew Brees are known for great downfield vision, sea urchins, hammerhead sharks and bees possess quite eye-opening visual skills.

Sphynx cats make up for their lack of hair with an abundantly affectionate personality. If cat hair's not "fur" you, then a Sphynx cat just might be!

Unseasonably cold weather and globally warm scenarios pose grave animal dangers to tropical fish, sea turtles, colobine monkeys, gorillas and other marine animals.

Seemingly mild creatures like cleaner fish, damselfish and fruit flies have recently shown that they have surprising wild sides when push comes to shove.

From past (venomous dinosaurs) to present (venomous jellyfish) to future (venom treatments), the evolution, dangers and benefits of venom continue to surprise.

For people uninterested in fighting for the hottest toy or gadget, considering dogs, cats or other animals as holiday gifts may be a cool approach this Christmas.