Crumbling infrastructure. Pitiful toilets. Overrun habitat. Those are just some of the things that have Sequoia National Park officials wanting to do some major restoration and rehabilitation work at Crystal Cave. And so they're asking for your thoughts on the proposal.

The mountain yellow-legged frog was once one of the most abundant vertebrates in the Sierra Nevada. The flash of its yellow legs could be seen and the echo of its croaking could be heard across the Sierra’s alpine lakes, even those nestled at 12,000 feet that contain watery habitats typically too cold for amphibians. Unfortunately, that empire began to crumble as long ago as 1850 when non-native trout were first transplanted into some of those lakes to increase fishing opportunities.

A 19-year-old visitor to Sequoia National Park was killed Monday when he fell about 50 feet from Tokopah Falls, according to the National Park Service.

The Park Service co-sponsored this year’s International Congress of Speleology (ICS), which has been going on all week in Kerrville, Texas. Many of the 1,300 participants signed up for field trips that included guided tours of developed and wild caves within NPS units.