https://www.flickr.com/photos/davea2007/9794837385
Tawny grisettes with the rounded caps of newly-grown fruiting bodies, which had probably come up overnight.
https://www.flickr.com/photos/davea2007/9794810505
Compare the flattened caps of the more mature versions.
https://www.flickr.com/photos/davea2007/9794840604
I thought the caps were more the range of colours of egg yolks than tawny.