![If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches genes on to make them spiky when they regrow. So on taller Holly trees, the upper leaves (which If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches genes on to make them spiky when they regrow. So on taller Holly trees, the upper leaves (which](https://preview.redd.it/2lhyol78xu881.png?auto=webp&s=6cb1250c29f3406fc7644046bd81dc6f63b041d0)
If Holly (Ilex aquifolium) finds its leaves are being nibbled by deer, it switches genes on to make them spiky when they regrow. So on taller Holly trees, the upper leaves (which
![Pair of Standard Festive Holly Trees for Christmas, Gardens & Patios, Attractive Evergreen Producing Red Berries, 2 x Holly Green Alaska (Ilex) 2 Years Old Standard Plant by Thompson & Morgan : Pair of Standard Festive Holly Trees for Christmas, Gardens & Patios, Attractive Evergreen Producing Red Berries, 2 x Holly Green Alaska (Ilex) 2 Years Old Standard Plant by Thompson & Morgan :](https://m.media-amazon.com/images/I/81umbK7pCyL._AC_UF1000,1000_QL80_.jpg)
Pair of Standard Festive Holly Trees for Christmas, Gardens & Patios, Attractive Evergreen Producing Red Berries, 2 x Holly Green Alaska (Ilex) 2 Years Old Standard Plant by Thompson & Morgan :
![Small Common Holly tree (Ilex aquifolium, European Holly) in Winter in a park in the UK Stock Photo - Alamy Small Common Holly tree (Ilex aquifolium, European Holly) in Winter in a park in the UK Stock Photo - Alamy](https://c8.alamy.com/comp/MC1ND0/small-common-holly-tree-ilex-aquifolium-european-holly-in-winter-in-a-park-in-the-uk-MC1ND0.jpg)