University San Marcos 17. oz. Supreme Water Bottle. Show your California State University, San Marcos pride all year long with our authentic assortment of California State University, San Marcos collegiate apparel - including California State University, San Marcos t-shirts, sweatshirts, hats and more.
When the Bird Daylight Laser 200 emits a powerful green light that hits bird feathers, it makes a bright splash of light. Which traumatizes them and they can't fly away fast enough. A flock of more than 100 geese immediately took flight..
The only bird known to make use of infrasound (at about 20 Hz) is the western capercaillie. The hearing range of birds is from below 50 Hz (infrasound) to around 12 kHz, with maximum sensitivity between 1 and 5 kHz. The range of frequencies at which birds call in an environment varies with the quality of habitat and the ambient sounds.