Wrong pip in conda env

I have a conda env called birdid.

While working in the env (i.e. I did source activate bird_dev), showing the list of the packages give

(bird_dev)...$ conda list
# packages in environment at /home/jul/Development/miniconda/envs/bird_dev:
#
...
pep8                      1.6.2                    py27_0  
pip                       7.1.2                    py27_0  
pixman                    0.26.2                        0  
...

but when trying to see what pip is used I get

(bird_dev)...$ which pip
/usr/local/bin/pip

while the correct python is found

(bird_dev)...$ which python
/home/jul/Development/miniconda/envs/bird_dev/bin/python

Anybody can help?

Edit: more details about the installed versions

Check which -a pip

(bird_dev)...$ which -a pip
/usr/local/bin/pip
/usr/bin/pip

The version in /usr/bin/pip is quite old.

(bird_dev)...$ /usr/bin/pip -V
pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)    
(bird_dev)....$ /usr/local/bin/pip -V
pip 6.1.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)

There is actually no pip in the env

$ ll /home/jul/Development/miniconda/envs/bird_dev/bin/ | grep pip

returns nothing

there is one pip in /home/jul/Development/miniconda/bin/pip

$ /home/jul/Development/miniconda/bin/pip -V
pip 6.1.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)

but it is not the version listed by conda list, and it is a python script (!)

$ cat /home/jul/Development/miniconda/bin/pip
#!/home/jul/Development/miniconda/bin/python
if __name__ == '__main__':
    import sys
    from pip import main

    sys.exit(main())

Edit: echo $PATH

(bird_dev)...$ echo $PATH
/home/jul/Development/miniconda/envs/bird_dev/bin:/home/jul/torch/install/bin:/home/jul/torch/install/bin:/home/jul/torch/install/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games

Edit: try to force install

(bird_dev)...$ conda install --force pip
Fetching package metadata: ....
Solving package specifications: .
Package plan for installation in environment /home/jul/Development/miniconda/envs/bird_dev:

The following packages will be UPDATED:

    pip: 7.1.2-py27_0 --> 7.1.2-py27_0

Proceed ([y]/n)? y

[      COMPLETE      ]|##################################################################################################################################################################################| 100%
Extracting packages ...
[      COMPLETE      ]|##################################################################################################################################################################################| 100%
Unlinking packages ...
[      COMPLETE      ]|##################################################################################################################################################################################| 100%
Linking packages ...
[      COMPLETE      ]|##################################################################################################################################################################################| 100%
(bird_dev)...$ which pip
/home/jul/Development/miniconda/envs/bird_dev/bin/pip
(bird_dev)...$ /home/jul/Development/miniconda/envs/bird_dev/bin/pip -V
pip 6.1.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)
(bird_dev)...$ cat /home/jul/Development/miniconda/envs/bird_dev/bin/pip 
#!/home/jul/Development/miniconda/envs/bird_dev/bin/python
if __name__ == '__main__':
    import sys
    from pip import main

    sys.exit(main())

Weird.