Tracy Aviary celebrates the Halloween Hoot this year with half price admission on Oct. 30 and 31 for anyone in costume ($2.50 for adults, $1.50 for kids 4-12).

Kids in costume get a spot in the parade and a safe place to trick or treat. The aviary also promises sing-a-longs with Music Together, face painting, bird shows and spooky stories at the Chase Mill on the 30th. Click here for more info.

But the scariest part...the birds.

In honor of the Halloween Hoot, here's the count down Tracy Aviary's top five scariest birds (all info on birds and photos courtesy of Tracy Aviary).

5. Black-crowned Night Heron

With its piercing red eyes, this heron stalks its food in the evening and dead of night. It plays statue near the water's edge, and as soon as unsuspecting prey swims by, the heron springs to life and gobbles it up. You'll find the bird in wetlands across five different continents and in the Kennecott Wetlands Immersion Experience in the aviary's northeast section.

4. Red-tailed Hawk

You'll know this hawk is near by its high-pitched scream, "KEEEE-EEE-AAARRR." Usually it perches on a high object like a pole or tall tree, keeping a watch for rodents reptiles and, yes, other birds. Sometimes it will just hover above the ground before catching its prey off guard. Find the hawk in Canada through Central America and the aviary's bird show.

3. Great Horned Owl

The great horned owl is a cerebral assassin of the Tracy Aviary. Its feathers are designed for stealth, and it has impeccable hearing and sight. The scariest part is it can rotate its head nearly 180 degrees, giving new meaning to 'eyes in the back its head.' Don't miss Tracy Aviary's great horned owl.

2. King Vulture

This vulture is known for eating the dead animals that would make most creatures turn away in disgust. A strong sense of sight and smell help it locate carcasses, while its bald head keeps it clean. Plus, just look at it... Other scavengers know to step aside when the king swoops down. Take a look at the aviary's pair of king vultures this Halloween.

1. Andean Condor

Like the King Vulture, this condor depends on carcasses for food, but unlike a vulture, it has a wing span of more than 10 feet. Imagine coming face to face with a bird that large in the wild! I'd head for the hills, but it wouldn't help—it can fly up to heights of 18,000 feet. They are found in the Andes and other areas of South America. The aviary's condor, Andy, just turned 51 years old this year.