control, coyotes have been spotted in several san francisco neighborhoods from vernal heights to glenn canyon to twin peaks and near lom barred street. >> there are city officials say every day, someone reports seeing a coyote. nature photographer spotted this one. >> i can tell he was keeping an eye on the area. you know sni was in his neighborhood. you know? >> and he says the coyote has what he calls a loving energy. the owner of these pit bulls say she and her dogs were stalked by a coyote last week. yesterday and today 22 signs were barring dogs from areas thought to be near coyote territory. >> they've been stalking and following people and bearing teeth which is normal behavior. >> he says during this time when pups are being born. >> they're trying to preserve and protect their babies. >> the city became aware of the coyotes when two were put down after an incident with a dog. officials say they've not been a threat to humans there was a community meeting last year after several sightings of the wild animals. leading to warning signs putting park users on alert. now as of today there

rec and park going on glenn canyon and twin peaks and other locations. if you are celebrating our earth today it's going to be looking mighty fine with the sunshine. >>> scientists are getting closer to making an electric car that can travel 500 miles on a single charge. concept is being working on at i.b.m. research park in san jose. karina rusk has more. >> this is what cutting edge battery innovation looks like. super computer has told these researchers it's possible to build a car battery light enough and powerful enough to travel 500 miles on a single charge. >> this is fundamental forces is actually occurring. like sherlock holmes you have a twists and turns going on. >> reporter: the battery 500 team is unraveling a mystery how to borrow oxygen from the air and produce a chemical reaction using lithium. one key element is membrane technology. >> it has to be enough for the air to get through and have the reaction to take place. >> battery technology takes time. i.b.m. hopes the batteries are powering our cars in the next 10-15 years. so far they h