Go back to the enewsletter On 1 September 2015

first_imgGo back to the e-newsletter >On 1 September 2015, Thredbo announced a 72-hour September snow sale to celebrate the optimum conditions Thredbo skifields are experiencing. The sale includes the release of the 3 Day Flexi Pass for only $199 for Adults, saving $140, and $109 for under 18/65+.The 3 Day Flexi Pass will be valid until the end of the season and can be used for skiing or snowboarding for any 3 days in Thredbo.Thredbo is offering other spring promotions during the month of September, including:Kids Ski Free – with any full paying adult’s 3- or 5-day lift passTorah Bright 3 for 2 Beginner Pack – back on sale giving beginners an extra day of skiing or snowboarding for freePay 4 Stay 5 – during the September school holidays and enjoy a free night and day, when you pay for 2 nights and a 2-day lift passGo back to the e-newsletter >last_img read more

These bats use stealth sonar likely to evade rivals

first_img By Roni DenglerMay. 1, 2018 , 7:01 PM Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe Michael Durham/Minden Pictures/Newscom Email 00:0000:0000:00 00:0000:0000:00 Click to view the privacy policy. Required fields are indicated by an asterisk (*) Sign up for our daily newsletter Get more great content like this delivered right to you! Countrycenter_img Hoary bats are habitual squawkers. Sporting frosted brown fur á la Guy Fieri, the water balloon–size bats bark high-pitched yips to navigate the dark night sky by echolocation. But a new study reveals that as they fly, those cries often drop to a whisper, or even silence, suggesting the bats may steer themselves through the darkness with some of the quietest sonar on record.To find out how hoary bats navigate, researchers used infrared cameras and ultrasonic microphones to record scores of them flying through a riverside corridor in California on five autumn nights. In about half of the nearly 80 flights, scientists captured a novel type of call. Shorter, faster, and quieter than their usual calls, the new “micro” calls use three orders of magnitude less sound energy than other bats’ yaps did, the researchers report today in the Proceedings of the Royal Society B. As bats approached objects, they would often quickly increase the volume of their calls. But in close to half the flights, researchers did not pick up any calls at all. So why risk starvation and fatal crashes? Making normal-intensity calls might attract unwanted aggression from potential rivals, say the researchers, who conducted their study during the bats’ mating season. Microcalls are much more discreet, slashing the distance that other bats can “eavesdrop” from about 92 meters to 12. So the stealth sonar might simply be part of a larger tactic to keep rival males out of earshot. This stealth flying mode may explain one sad fact of hoary bat life: They suffer more fatal run-ins with wind turbines than other bat species in North America. The microcalls are so quiet that they reduce the distance over which bats can detect large and small objects by more than three times. That also cuts bats’ reaction time by two-thirds, making them too slow to catch their insect prey. Listen to a regular hoary bat call here. These bats use stealth sonar, likely to evade rivals Listen to a microcall here. last_img read more